The son's story begins here. For house renovations, son Yasuhiro Sawamura and mother Reiko Sawamura are temporarily staying at the home of Reiko's real sister and Yasuhiro's aunt, Sorami Haga. Tatsuo Haga, their cousin who moved to Tokyo for college and started living alone, is also renting a room in the family home. Yet neither has fully returned to their own place, leaving everyone in a state of unsettled limbo. Reiko, in particular, seems acutely aware of being a guest, diligently handling household chores while quietly carrying an undercurrent of anxiety. Yasuhiro, observing her closely over time, finally notices something—his mother's bra is slightly lifted.