Enomoto-senpai wa Tenshi nanka ja Nai

In Hagino's room is the ghost (?) of a man who was supposed to have died in an accident, Enomoto. Enomoto is a bold man with a mean look in his eyes and is the best friend of Hagino's crush. Like the Grim Reaper, Enomoto declares, "If I can take my best friend's life within 49 days, I can come back to life in his place."

(Source: Shu-cream, translated)