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Nakahara Chuuya, a guardian angel, has been assigned a new human to look after. A man known as Dazai Osamu- who had lost his previous guardian angel in an accident.
Chuuya quickly learns that watching over Dazai is going to be a lot more work than he had previously anticipated. When he's not making sure Dazai doesn't get killed, Chuuya is haunted by hazy and painful memories of a time when he, himself, was a human.