Heita lives with his retired grandfather in a small rural community boarding house that closed after his grandmother died, while he attends school and looks after the one remaining boarder, Miharu, a university researcher who seems incapable of looking after himself. He has some vaguely realized feelings toward Miharu which he expresses by preparing luxurious bentou and sharing the futon during rainstorms. Meanwhile, Miharu's feelings for Hei-chan are hardly vague, but he is an adult and Heita isn't, and that seems to mean something in this story.
Hidamari to Bentou Danshi to