Orie is a widow who lost her husband in an accident late last year. - Currently, she lives with her only son, Masaaki. - After his father passed away, Masaaki quit his job and became a shut-in at home. - Worried about Masaaki, Orie continues to take care of Masaaki. - But that's just a guess. - Both Orie and Masaaki had been aware of each other as members of the opposite sex since before their husbands (fathers) were alive. - One day, Orie invites Masaaki and the two end up going on a hot spring trip. - On that trip, the two...