Completed

Shin Megami Tensei - If...

Action Adventure Drama Fantasy Horror Mature Philosophical Psychological Sci-Fi Seinen Slice of Life Thriller Tragedy

Based on the Shin Megami Tensei If videogame.
The setting is Karukozaka High School, which is mysteriously sucked into a void and emerges in the realm of Makai, a world of demons. Most of its students and school employees are trapped in the other world along with it.