A mysterious “ritual vessel” delivered to the Faculty of Archeology during the summer vacation of the school. I and the members who were there suddenly lost consciousness when they were exposed to the light emitted from the ritual vessel. When I woke up, my consciousness remained mine, and her body changed to Yoshimi Kurahashi, who longed for her like her sister. My sister’s girl’s body is very soft, it smells good, and it’s sly to feel like this, it’s completely different from a man … The other members who were exposed to the light of the rituals also exchanged their “mind” and “body” and were led to the world of physical desires hidden by their close friends. A bizarre phenomenon that is repeated many times. Can we really return to the original world?