Nagomu Irino returns to his Kyoto home for the first time in ten years when his father is hospitalized. Nagomu is eager to take over Ryokushou, the family's Japanese sweet shop, but he's instead asked to be a father figure to Itsuka Yukihira, the girl everyone calls the successor.

The "apartment comedy with laughs and tears" centers on a four-year-old boy named Kotarou Satоou, who moves next door to Shin Karino, an unsuccessful manga artist. Kotarou has no parents and lives alone. Not only does he seem to earn a living, he actually seems more put together than his own strange neighbors.

Second season of .