Rena, a mother who struggles with her son Takeshi's withdrawal. She is at a loss as to what to do, but her friend Matsuoka is the only one who visits her often and encourages her. One day, Matsuoka recommends jogging together to get the attention of Takeshi, who was in the track and field club. Rather than doing nothing, the two of them take the suggestion and start running immediately from the next day. Takeshi, who follows the happy running back with his eyes, feels envious of the situation, and leaves the room to talk to the two who have returned, but to his surprise, they are lying on the bed...