After making two promises: ``I'll be the one to contact you, and always use a condom when we have sex,'' Satsuki began an affair with Kenji, a man she met at her part-time job. One day, when her husband was away on a business trip, the two of them came to a hot spring inn. Satsuki was basking in the sunlight filtering through the trees, proudly holding hands and savoring the joy of being able to go on a date, but... However, Kenji had a certain determination hidden in his heart. In order to have Satsuki all to himself, he tries to lift the forbidden "creampie"...