At a reluctant Kiryu's behest, Majima is called upon to look after Haruka for a day. A series of misadventures involving totally rigged arcade machines, dubious shopping habits, surprisingly good karaoke, unexpected visitors, and uncomfortable interrogations ensues.

Goro Majima wasn't much for taking care of a little kid, but when he finds one living on one of his construction sites, he takes the mysterious kid under his wing. After that, it forces Majima into the world of heroes, fatherhood, dodging his past, and quirks. Man, the Mad Dog of Shimano just can't catch a break, can he?