Yuujou Chuudoku Shoureisha

Ryouichi and Tsukasa have been close friends for a long time, sharing a strong and trusting bond. Tsukasa, unaware of the anatomical difference between boys and girls, firmly believes they are a boy and always uses the men's restroom alongside Ryouichi. Their friendship seems simple and unbreakable, built on years of shared experiences and mutual understanding.

However, everything changes when Ryouichi accidentally discovers that Tsukasa actually has the anatomy of a girl. Instead of revealing the truth to his friend, Ryouichi decides to take advantage of the situation. He uses this secret knowledge to create a new, intimate bond with Tsukasa, manipulating their friendship into something far more complicated and physical. As Ryouichi pushes the boundaries of their relationship, Tsukasa remains blissfully unaware of the deception, trusting their friend completely while their connection takes an unexpected and dangerous turn.