Kurazaki Eisuke, a former detective, now runs a convenient "Subscription Detective" service. His life was picture-perfect with his wife, Sakuna, who had proposed to him during their college days, believing he was her one and only. Though childless, the couple led a content life.
Everything changed when Yoda Makoto, a university student with dreams of becoming an influencer, approached Eisuke with a request: "I think my girlfriend's cheating on me. Could you investigate?" Eisuke took on the case, but upon tracking down Yoda's mysterious girlfriend, he was shocked to discover it was none other than his own wife, Sakuna.
Eisuke couldn't comprehend why his devoted wife, who had pledged her love and future to him, would betray their vows. Despite the pain in his heart, he pressed on with the investigation, only to uncover the hidden desires lurking beneath Sakuna's seemingly prudish exterior.