Kenichi and several of his friends stay after school to look at a new archaeological find, a bizarre looking mirror. Suddenly, the entire building is transported to an alternate dimension and a magic field surrounds it to prevent them from escaping. Also, their minds have switched to other people's bodies. The only way to switch bodies is when their sexual emotions are high.
During the summer break of the high school, a mysterious vessel used for the ritual was sent to the archaeology club. The club members and I lost our conscience when the light from the vessel illuminated us. When I came to, my conscience was transferred into the body of Kurahashi Yoshimi whom I adored like my elder sister. Her body of a girl was very soft, smelled good, and so sensitive to sexual pleasure. It was unfair that the woman was totally different from the man