At a farewell party held for women's judo athlete Mariya Noguchi, Luna from the school choir performed a support song. Mariya was scheduled to express her gratitude by demonstrating judo techniques, but her sparring partner dropped out due to illness. As a result, Luna was hastily chosen to step in as her replacement. Mariya, an experienced judo black belt, specializes in submission holds that emphasize smoothly and comfortably taking down her opponent without causing pain. Though reluctant at first, Luna accepted—and since she had never previously fainted from chokeholds, she appeared completely immune. However, when pressure is applied to her carotid artery, cutting off blood flow to her brain, she rolls her eyes back, loses consciousness, and begins foaming at the mouth. While unconscious, she unpredictably sings, snores, or experiences full-body convulsions. Repeatedly choked unconscious and revived again, this amateur woman's mental state gradually deteriorates, plunging her into a state of dissociation and loss of self-awareness—a process captured in full detail.