Yoshifumi Nitta, a yakuza member, is celebrating the successful acquisition of a valued vase for his collection when a gigantic, strange capsule materializes and falls on his head. He opens the capsule to find a young, blue-haired girl who reveals little about herself other than her name—Hina—and the fact that she possesses great powers. As if things couldn't get much worse, she loses control and explodes if her powers aren't employed. Nitta is forced to become her carer since he has no other option. Nitta begs Hina to assist her with a building transaction, which goes off without a hitch. While everything is going on, a rival yakuza group attacks his boss discreetly. Nitta was taken aback.