Kenichi Aoshima, a high school archaeology club member, is thrust into the center of a supernatural crisis when examining an ancient mirror artifact after school. The artifact transports the entire school building to an alternate dimension, sealing everyone within an inescapable magic field. Simultaneously, Kenichi and others begin experiencing involuntary body swaps, their minds transferring between physical forms during moments of intense sexual arousal. Trapped in this chaotic dimensional prison, Kenichi must navigate the escalating reality shaped by heightened emotions.

His relationships define the ordeal. Childhood friend Miho Akiyama, who harbors unspoken romantic feelings, suffers psychological torment when separated from her body during swaps, culminating in a mental breakdown and suicide attempt Kenichi intervenes to stop. His student and club junior, Sakajou Hikaru, exploits the body-swapping chaos to consciously act on her previously unrequited feelings, manipulating situations to fulfill hidden, perverse desires involving Kenichi. Friend Yoshimi Kurahashi experiences less psychological trauma despite occasional involvement in bizarre scenarios, while Yukino Ozawa and Konomi Akiyama (Miho's younger sister) face secondary effects from the artifact's influence on suppressed emotions.

Throughout, Kenichi exhibits desperation and determination to reverse the body swaps and escape the collapsing dimension. He grapples with the psychological and moral weight of inhabiting others' bodies and witnessing their actions, particularly Sakajou's calculated exploitation. His focus is restoring normalcy amid the artifact-induced sexual encounters amplifying the group's hidden urges, racing against the dimension's accelerating instability to resolve the supernatural crisis before reality disintegrates.