During summer break, the archaeology club receives a mysterious vessel tied to an ancient ritual. A sudden light from the artifact causes the members to lose consciousness, and upon waking, the narrator discovers his mind has transferred into the body of his admired senior, Kurahashi Yoshimi. Her form feels soft, fragrant, and unusually responsive, highlighting the profound differences from his own. As the others experience similar swaps, they are drawn into an eerie sequence of exchanged identities and emerging desires.