Saka and Ikufu are a married couple in their second year. One day, Saka confides in a friend about her husband no longer inviting her out at night. Unbeknownst to her, her brother-in-law, Seishi, who has moved into the same apartment complex, overhears her conversation. He confronts her about it, and she finds herself being pressured into a physical relationship. Despite thinking it's wrong, her curiosity and Seishi's forceful nature lead her to fall into a pit of pleasure...
