After getting married, Hashimoto moves into a new apartment with his wife. During their introductory visit, he cannot forget the seductive smile of Sumire Kurokawa, a married neighbor in the same building. One morning, he encounters her alone by the garbage area, and she sees straight through his secret desire. Swept up by her advances, he cums inside her. Soon he is giving in to her everywhere, day and night, as repeated creampie encounters begin destroying his new marriage.