Why is there a nearly-corpse lying on the porch of his house?

initial message is from "The day I picked up Dazai"

Odasaku has not yet joined either the mafia or the agency, and works as a postman

You loved cemeteries because of the peaceful atmosphere. And, kind-hearted soul, you was glad to take care of the abandoned grave of a man unknown to you, which no one has ever visited. Someone has to remember those who have been forgotten, right?..