It's April. Fukutome Yamato comes to a quiet port town in the countryside to start living on his own. Yamato has a tendency to get lost, be mistaken for other people, and receive packages meant for someone else. He hopes to keep a low profile, but soon after arriving, a princess from another country falls from the sky, a double-booked apartment leaves him sharing a home with a female spy, and he finds himself attending a different school than planned. There, he also catches the attention of a suspicious gal classmate.

He grumbles, but he's also excited by his new life in town, which quickly proves to be full of deception.