Orie, a widow who lost her husband in an accident at the end of last year. Currently, she lives with her only son, Masaki. Masaki quit his job after his father died and became a recluse at home. Worried about such Masaki, Orie continues to take care of him. But that's just for show. Both Orie and Masaki had been aware of each other as the opposite sex since before her husband (father) was alive. One day, Orie invited Masaki, and the two decided to go on a hot spring trip. On that trip, the two…