Mahiro gave birth to Taichi, but Taichi's father had an affair with Mahiro. Mahiro chose the path of a single mother and raised Taichi. She works hard not to make him feel bad, and Taichi responds by helping with the housework without being selfish, but loneliness is building up. On the other hand, by the time Taichi graduated from college, Mahiro took Taichi with him on a late summer vacation in order to use up her paid leave.
