Ano Koro, Boku-tachi wa Tenshi ga Mieta. ~Bed no Ue no Kanojo ni Koishita 365-nichi~

Daiki, raised in a single-mother household, is in the middle of his rebellious phase, a delinquent middle schooler who makes teachers cry. But in front of Kagura, the frail, hospitalized daughter of his homeroom teacher, he somehow becomes obedient. One day, a boy claiming to be an angel that only those two can see appears. The boy says that if Daiki completes the tasks he gives him, he will grant Daiki's wish, but...?

Source

CMOA, translated