The Angel Beats! Anime story of Otonashi's time in this strange afterlife, as he learns about his situation, interacts with the others in the SSS and Tenshi, waits to regain his memories, and decides what to do after he does.
The main male protagonist Otonashi wakes up at a high school, and he finds out that he has lost all of his memories. Then a spunky female student appears and told him that he has died, and asked whether he wants to join her terrorist organization. Deciding that she is just crazy, the main protagonist walks away and encountered another female student who has white hair.