Getting Into a Risky Relationship with My Wife’s Sister!?

Synopsis

Yusuke Miyanakas is entering his second year of marriage with his wife Miori. Their marriage has been smooth sailing without a single argument until now.

However, a minor disagreement escalates into a real fight, leading to a complete loss of intimacy between them. To clear his head at a friend’s suggestion, Yusuke visits a suspicious establishment and unexpectedly encounters Hiori, his wife’s younger sister.

Hiori works at this shop in secret, desperate to keep it hidden from her parents and sister Miori. Driven by curiosity and long-held feelings for Yusuke, she coerces him into an intimate relationship. With his own pent-up sexual frustration, Yusuke finds himself unable to resist and gives in to her advances.

While Yusuke intended their encounter to be a one-time affair, Hiori—having experienced sexual pleasure for the first time and fulfilled her long-standing desire—wants to continue their physical relationship. Despite wanting to end things with Hiori, Yusuke finds himself drawn deeper into the affair. Eventually, Miori begins to grow suspicious, and Yusuke finds himself increasingly cornered…