After losing her husband, Eiko raised her son Hiroshi all on her own. Though she doesn't look particularly impressive at first glance, she deeply loves Hiroshi more than anything. However, Hiroshi has one major flaw—he's extremely weak in the mornings. One day, despite Eiko waking him up early, he overslept on an important day. This triggers a huge argument between them, leading to a complete breakdown in communication. For several days, they don't speak a single word to each other. Then, following a certain incident, Hiroshi begins to realize how truly meaningful his mother's presence is. At that moment, their relationship takes another dramatic turn.