20 Best Anime series like I've Been Killing Slimes for 300 Years and Maxed Out My Level (2021)

15 years ago, an unknown hyperspace gate opened over the Pacific. Beyond this gate lies Reto Semaani, a strange alternate world where fairies and monsters live.San Teresa City—a city where over two million immigrants live from both worlds. As a result, there are the haves and the have-nots. Here is the world's newest "city of dreams." But in the shadow of the chaos, crime is rampant: drugs, prostitution, and weapon trafficking. The detectives who stand up to these heinous crimes are in the San Teresa City Police. When the detective Kei Matoba and the alternate-world knight Tirana—two individuals who differ in gender, personality, and even world of origin—meet, an incident erupts. Two worlds. Two justices. From this, the curtain rises on a buddy police action story!

Historically 72% of all the deaths in London are related to dragons, fantastical beings invisible to the majority of the people.While unknown to most, some people have been standing up to these dragons.Only inhabitants of Reverse London who live in the hidden “reverse” side of London can see the dragons. Even then, only a selected few become qualified enough as witches or wizards to make direct contact with them.The protagonists of the story are witch duo Noel Niihashi and Ninny Spangcole. They are protection agents for Wing Bind (WB), an organization for dragon conservation and management. Their mission is to protect and manage the dragons within London on behalf of the people.

Kojou Akatsuki's days as an ordinary high school student in the Demon District of Itogami Island come to an abrupt end after a fateful encounter leaves him with the remarkable abilities of a vampire. It isn't long before he is thrust into the center of attention when it is discovered that he is the fourth primogenitor, an immensely powerful vampire whom most consider to be merely a legend. Fearing Kojou's destructive potential, the Lion King Organization sends in an apprentice sword-shaman, Yukina Himeragi, to monitor, and should he become a threat, kill the boy deemed the world's most powerful vampire. Forced together by circumstance, the two form an unlikely alliance as Kojou comes to terms with his abilities and they both struggle to protect the city from various emerging chaotic forces.

Most girls waking up without any memory and meeting a serial killer would panic, but not Rachel. In fact, far from being her biggest problem, killer Zack might just prove a convenient resource when it comes to finding a way out of the building in which they're both trapped!

As regular high school students Taichi and Rin disappeared in a beam of light. When they came to, the two of them were already in a world of swords and magic. Finally getting away after experiencing an attack by monsters, following the suggestion of adventurers they headed on the path towards the guild. In the guild, the two of them found out that they possessed unbelievably powerful magic. Thus the regular high school students transformed into the strongest cheats...

Chise Hatori, 15 years old. Lost, without hope, and without family, she is bought for money – not by another person, but by a non-human sorcerer named Elias. Though she hesitates, she begins life anew as his apprentice and future wife.

All thanks to the special ability that he developed, Yuu was able to cheat his way into a very prestigious high school. With his power, he thought nothing was going to stand in his way, until he met a mysterious girl named Nao Tomori and other students with special abilities just like him. It was the beginning to a new life.

Ren Amamiya is about to enter his second year after transferring to Shujin Academy in Tokyo. Following a particular incident, his Persona awakens, and together with his friends, they form the “Phantom Thieves of Hearts” to reform hearts of corrupt adults by stealing the source of their distorted desires. Meanwhile, bizarre and inexplicable crimes have been popping up one after another… Living an ordinary high school life in Tokyo during the day, the group maneuvers the metropolitan city as Phantom Thieves after hours. Let the curtain rise for this grand, picaresque story!

A samurai lord has bartered away his newborn son's organs to forty-eight demons in exchange for dominance on the battlefield. Yet, the abandoned infant survives thanks to a medicine man who equips him with primitive prosthetics—lethal ones with which the wronged son will use to hunt down the multitude of demons to reclaim his body one piece at a time, before confronting his father. On his journeys the young hero encounters an orphan who claims to be the greatest thief in Japan.

Off-duty Japan Self-Defense Forces (JSDF) officer and otaku, Youji Itami, is on his way to attend a doujin convention in Ginza, Tokyo when a mysterious portal in the shape of a large gate suddenly appears. From this gate, supernatural creatures and warriors clad in medieval armor emerge, charging through the city, killing and destroying everything in their path. With swift actions, Youji saves as many lives as he can while the rest of the JSDF direct their efforts towards stopping the invasion.Three months after the attack, Youji has been tasked with leading a special recon team, as part of a JSDF task force, that will be sent to the world beyond the gate—now being referred to as the "Special Region." They must travel into this unknown world in order to learn more about what they are dealing with and attempt to befriend the locals in hopes of creating peaceful ties with the ruling empire.

Avid bookworm and college student Motosu Urano ends up dying in an unforeseen accident. This came right after the news that she would finally be able to work as a librarian as she had always dreamed of. When she regained consciousness, she was reborn as Myne, the daughter of a poor soldier. She was in the town of Ehrenfest, which had a harsh class system. But as long as she had books, she didn't really need anything else. However, books were scarce and belonged only to the nobles. But that doesn't stop her, so she makes a decision... "If there aren't any books, I'll just create some."

On a continent ruled by chaos, the Lords have the power of a holy seal that can calm the chaos and protect the people. However, before anyone realizes it, the rulers cast aside their creed of purifying the chaos, and instead start to fight each other for each other's holy seals to gain dominion over one another. Siluca, an isolated mage who scorns the Lords for abandoning their creed, and a wandering knight named Theo, who is on a journey to train to one day liberate his hometown, make an everlasting oath to work together to reform this continent dominated by wars and chaos.

In the year 2138, virtual reality gaming is booming. Yggdrasil, a popular online game is quietly shut down one day. However, one player named Momonga decides to not log out. Momonga is then transformed into the image of a skeleton as "the most powerful wizard." The world continues to change, with non-player characters (NPCs) beginning to feel emotion. Having no parents, friends, or place in society, this ordinary young man Momonga then strives to take over the new world the game has become.

Aya Asagiri is a middle school girl who has problems both at school with bullying and at home from physical abuse by her brother. While browsing online, a website pops up on her computer featuring a creepy looking person. This person appears to take pity on her, and announces that she has granted Asagiri magical powers.

Lucy is a 17-year-old girl, who wants to be a full-fledged mage. One day when visiting Harujion Town, she meets Natsu, a young man who gets sick easily by any type of transportation. But Natsu isn't just any ordinary kid, he's a member of one of the world's most infamous mage guilds: Fairy Tail.

A typical morning. The usual music. Their normal lives. The peace these seven girls experience will suddenly be destroyed. By the living dead... zombies. A reality that they never wanted a part of, an amazing and terrifying zombie world. They all share one wish: "We want to live." These girls will struggle through this saga, in order to achieve a miracle.

The historical epic centers on Shichika Yasuri, the seventh generational head of the Kyotō-ryū school of martial arts in medieval Japan. He and his older sister Nanami live on an isolated island, until a military advisor named Togame tells him of the final 12 swords forged by a legendary swordsmith. At Togame's bidding, Shichika embarks on a journey to find all 12 of the swords.

Invertia was a meteor storm that caused an unprecedented disaster during the 20th century. Because of this disaster, numerous cities around the world were destroyed. However, within the meteor, an unknown element called mana was discovered. It allowed human technology to make rapid strides giving rise to a new species of super-powered humans, the Star Pulse Generation (Genestella). The Festas (Star Warrior Festivals) host battles between Genestella at a city of six academies called “Rikka,” also commonly known as “Asterisk.”Scholarship student Ayato Amagiri transferred into Seidoukan Academy in order to fulfill his own wish, swearing he too will fight in this city.

The Alzano Imperial Magic Academy is located in the southern part of the Alzano Empire and is among most prominent magic schools in the world, where students can learn the highest forms of magic. All those who strive to learn magic dream of studying at this academy, and its students as well as its teachers are proud to be a part of its 400-year history. Glenn Radars is a new instructor who has suddenly been appointed to teach part-time at this highly respected academy. The previously unheard-of lessons of this man known as a good-for-nothing bastard are about to begin.

The Shaman King is the one who can contact the king of spirits and reshape the world. Every 500 years, shamans, who can commune between the worlds of the living and dead, compete in the Shaman Fight to become the next Shaman King.Among those aiming for the top is a young shaman named Yoh Asakura.

Fourteen-year-old Suzuki Iruma has just been abandoned and sold to a demon by his irresponsible parents! Surprisingly, the next thing he knows he's living with the demon who has adopted him as his new grandson, and has been transferred into a school in the demon world where his new "demon" grandfather works as the principal. Thus begins the cowardly Iruma-kun's extraordinary school life among the otherworldly as he faces his true self, takes on challenges, and rises to become someone great.

The story takes place in the year 1614. Two ninja clans, Tsubagakure of the Iga and Manjidani of Kouga, battle each other to determine which grandson of Tokugawa Ieyasu will become the next shogun. The deadly competition between 10 elite ninja from each clan unleashes a centuries-old hatred that threatens to destroy all hope for peace between them.

Dale is a cool, composed, and highly skilled adventurer who's made quite a name for himself despite his youth. One day on a job deep in the forest, he comes across a little devil girl who's almost wasted away. Unable to just leave her there to die, Dale takes her home and becomes her adoptive father.Devil or not, Latina is beyond adorable, and the adventurer soon finds himself head over heels with being a parent.But why was she out in the forest to begin with, and why does she carry the mark of a criminal?

There is a place after death that’s neither heaven nor hell. A bar that serves you one chance to win. You cannot leave until the game is over, and when it is, your life may be too. From Studio Madhouse (Death Note, Black Lagoon) comes a thrilling new series where the stakes are high and the rules are simple: your life is on the line.

In a fantasy world, fighter Tatsumi sets out for the Capitol to earn money for his starving village, and finds a world of unimaginable corruption, all spreading from the depraved Prime Minister who controls the child Emperor's ear. After nearly becoming a victim of this corruption himself, Tatsumi is recruited by Night Raid, a group of assassins dedicated to eliminating the corruption plaguing the Capitol by mercilessly killing those responsible.

High school student Eruna Ichinomiya enters the Mikagura Academy dreaming of a boarding school life filled with beauty. However, Eruna finds out that in the culture clubs, there is a rule that battles that are fought with special powers decide a club representative's treatment. Through various circumstances, Eruna becomes a representative of a club, and is thrown into the fray.

Waver Velvet – The boy who fought side by side with the King of Conquerors, Iskandar, during the Fourth Holy Grail War in Fate/Zero. Time has passed, and the mature Waver has now adopted the name of Lord El-Melloi II. As Lord El-Melloi II, he takes on numerous magical and mystical cases in the Clock Tower, the mages' mecca...

Seventeen-year-old Hajime Nagumo is your average, everyday otaku. However, his simple life of pulling all-nighters and sleeping in school is suddenly turned upside down when he, along with the rest of his class, is summoned to a fantasy world! They're treated like heroes and tasked with the duty of saving the human race from utter extinction. But what should have been any otaku's wet dream quickly turns into Hajime's nightmare. While the rest of his class are blessed with godlike powers, Hajime's job, Synergist, only has a single transmutation skill. Ridiculed and bullied by his classmates for being weak, he soon finds himself in despair. Will he be able to survive in this dangerous world of monsters and demons with only a glorified blacksmith's level of strength?

In a post-apocalyptic world dominated by the so-called "Numbers," each human will have their identity branded with their own "Count," which could define any number related to their life. May it be one's walked distance or amount of compliments given to them by others, this Count could lead them to the abyss when it has dropped to zero.In the year 305 of the Alcian calendar, Hina has inherited a mission from her Mother, whose Count has depreciated to zero, to search for the Legendary Red Baron. In her adventure, she meets a half-masked swordsman named Licht who tries to hide his identity, as he is known as a degenerate for having an incredibly low Count.

Asta and Yuno are two orphans who want the same thing: to become the Wizard King. Locked in a friendly rivalry, they work hard towards their goal. While Yuno excels at magic, Asta has a problem uncommon in this world: he has no powers! But, on the day they receive their grimoires, they surprise everyone. To reach their goal, they’ll each find their own path to greatness—with or without magic.

Anos Voldigord was a tyrannical Demon King that eradicated humans, spirits, and even the gods, but became bored of eternal warfare and reincarnated with dreams of a peaceful world. However, what awaited him in reincarnation after 2000 years were descendants who became too weak after being accustomed to peace, and all sorts of magic that deteriorated to the extreme. Anos enters Demon King Academy that gathers and educates those who are viewed as the reincarnation of the Demon King, but the academy could not see through his true powers and ends up branding him as a misfit.

Friendless college girl Sorawo finds a door to another world one day — a strangely post-apocalyptic-feeling Otherside with serene emptiness, which becomes her new “special place.” There, she meets one other human, the beautiful and independent Toriko, and they explore the abandoned Otherside together.

Yuuji Itadori is a boy with tremendous physical strength, though he lives a completely ordinary high school life. One day, to save a friend who has been attacked by Curses, he eats a finger of Ryoumen Sukuna, taking the Curse into his own soul. From then on, he shares one body with Sukuna. Guided by the most powerful of sorcerers, Satoru Gojou, Itadori is admitted to the Tokyo Prefectural Jujutsu High School, an organization that fights the Curses... and thus begins the heroic tale of a boy who became a Curse to exorcise a Curse, a life from which he could never turn back.

After hitting her head particularly hard one day, Duke Claes' daughter, Katarina, suddenly recalls all the memories of her past life: that of a teenage Japanese girl. Just before her untimely death, this girl recalls playing an otome game... that is exactly like the world she's living in now! She is now Katarina Claes, the antagonist of the otome game, who nastily hounded the protagonist until the end. Knowing all the possible outcomes of the game, she realizes that every single possible route ends with Katarina being murdered or exiled! In order to avoid these Catastrophic Bad Ends, she has to use her knowledge of the game and her own wiles, starting with breaking off this engagement with the prince... Will Katarina survive while making her way through this world, where bad flags trip at every turn? Find out in this reverse-harem rom-com, led by everybody's favorite villainess!

At the young age of 11, Kotoko Iwanaga was abducted by youkai for two weeks and asked to become their "God of Wisdom," a mediator between the spirit and human worlds, to which the girl quickly agreed but at the cost of her right eye and left leg. Now, six years later, whenever youkai wish for their problems to be solved, they make their way to Kotoko for consultation.Meanwhile, Kurou Sakuragawa, a 22-year-old university student, has just broken up with his girlfriend after he fled alone when the two encountered a kappa. Seeing this as her chance to become closer with him, Kotoko immediately makes her move, hoping to get married to Kurou one day. However, she quickly realizes there is something more to Kurou. With this knowledge, she asks for his help in solving the various issues presented by the supernatural, all the while wishing her newfound partner will eventually reciprocate her feelings.

"Super Sonico" debuted as Nitro+'s live mascot girl, and her world will be brought to life in the anime, "SoniAni - SUPER SONICO THE ANIMATION -"!

Tatsu, a notorious and feared yakuza leader nicknamed "The Immortal Dragon," withdraws from the criminal syndicate and becomes a housekeeper to help his wife, Miku. The series features a variety of comedic settings, typically showing Tatsu's domestic activities and intimidating inequality with his looks, as well as multiple encounters with his former colleagues and rivals in the Japanese Criminal Syndicate.

Iwatani Naofumi was summoned into a parallel world along with 3 other people to become the world's Heroes. Each of the heroes respectively equipped with their own legendary equipment when summoned, Naofumi received the Legendary Shield as his weapon. Due to Naofumi's lack of charisma and experience he's labeled as the weakest, only to end up betrayed, falsely accused, and robbed by on the third day of adventure. Shunned by everyone from the king to peasants, Naofumi's thoughts were filled with nothing but vengeance and hatred. Thus, his destiny in a parallel World begins...

34-year-old virgin loser is kicked out of his home by his family and realized that his life is completely over. As he regrets wasting his life, a truck runs him over and he died. When he wakes up... He’s in a world of sword and sorcery! Reborn as a baby named Rudeus, he decides that this time, he’ll live a life he won’t regret!

When she was a little girl, Atsuko "Akko" Kagari saw a magic show performed by a witch named Shiny Chariot. From that day on she wanted to be just like her. Enrolling at Luna Nova Magical Academy and having no magical background, can she become a witch like her idol Shiny Chariot?