Yuika Takashima stars as a devoted wife who reconnects with a former lover, a decision that quickly spirals into a dangerous affair. What the husband initially dismisses as harmless 'playing with fire' (Hi-asobi) soon transforms his wife into a woman consumed by insatiable desire. As she descends into a state of uninhibited nymphomania (Inran), her husband is forced to witness the complete collapse of their marriage. The film explores the psychological aftermath of her betrayal and the awakening of a secret side of her personality that can never be suppressed again