As summer break begins, the high school archaeology club receives a mysterious vessel meant for an ancient ritual. A sudden burst of light knocks everyone unconscious, and the protagonist awakens to find his consciousness now housed in the body of a cherished upperclassman. The other club members have likewise experienced mind and body exchanges, leaving them to navigate unfamiliar physical sensations and shifting realities. These unsettling phenomena quickly draw the group toward a hidden realm of desire, raising urgent questions about whether they can ever return to their original selves.