Owarimonogatari Second Season

Koyomi wakes up to see Mayoi Hachikuji, a girl who supposedly went to the afterlife, and she tells him they are in a strange world. As they navigate this new reality, dark secrets and supernatural forces unfold.

Third and “Final Season” of the Monogatari Series, part 4/5. Contains the arcs Mayoi Hell, Hitagi Rendezvous, and Ougi Dark from the Owarimonogatari light novels. Koyomi wakes up to see Mayoi Hachikuji before him, the girl who supposedly had gone to the afterlife. She tells Koyomi that they are currently in Avichi, the lowest levels of hell. Koyomi is dubious of how Mayoi knew about the exact timing of his death and which hell he would drop into, when Mayoi tells him that she was there to pick him up by the request of a certain individual. (Source: Aniplex)