Mahiro gave birth to Taichi, but Taichi's father had an affair with Mahiro. Mahiro chose to be a single mother and raised Taichi. He worked desperately not to make him feel pity, and Taichi responded by helping with the housework without saying selfishness, but loneliness had accumulated. On the other hand, by the time Taichi left college, Mahiro took a late summer vacation with Taichi to digest the accumulated paid leave.
