Visiting home during his university break, Yuya reunites with Rin, his mother's friend and once his secret crush. That night, learning she'll be staying over, Yuya lies awake, too nervous to sleep. Drunk and unguarded, Rin suddenly appears in his room, drawing close with unexpected boldness. Unable to resist, they end up sleeping together. Thrilled by their secret affair, Yuya grows increasingly excited, while Rin, troubled by her marriage, begins to think "this can't go on" after their physical encounter. As their emotions intertwine, the two navigate uncertain feelings, searching for a new beginning in their complicated relationship.