Monogatari Series Second Season (tv-series, 2013)

Tsubasa and Hitagi discover that Koyomi has gone missing and has urged them in a text message not to look for him. However, in his absence, new dangerous apparitions begin to appear and target Tsubasa, and Nadeko who are left to try and deal with them on their own. Meanwhile, Koyomi Shinobu, and Mayoi are dealing with serious problems of their own.