Kenichi Aoshima is a student and archaeology club member. During a summer break examination of a newly acquired artifact—a strange mirror—at his school, he witnesses its activation. The artifact transports the entire building and everyone inside to an alternate dimension. This dimension traps them behind a magical barrier and forces their minds to switch bodies. The body-switching mechanism is triggered by heightened sexual emotions; transfers occur when these emotions peak.

Regaining consciousness in this dimension, Kenichi discovers he inhabits the body of his longtime childhood friend, Yoshimi. Seizing the opportunity, he explores the unfamiliar physical sensations of the female form. Shortly after returning to his original body, interactions with another friend, Hikaru, lead to experiences driven by his male desires.

Kenichi harbors unspoken romantic feelings for his childhood friend Miho but lacks the confidence to express them. The dimension's environment rapidly breaks down inhibitions and awakens suppressed desires, forcing him to confront these feelings. This leads to increased honesty with himself and with Miho. Together, they collaborate to understand and resolve the dimensional anomaly, seeking a way to restore their original bodies and escape before the collapsing dimension becomes unsurvivable. His actions demonstrate a focus on resolving the crisis through direct engagement with the dimension's mechanics and reliance on cooperative relationships.