Trapped in a violent household, siblings find their lives disrupted by the arrival of a new mother figure, Aimi. Unlike their abusive father, she is kind, pure-hearted, and outwardly fragile—though inwardly perceptive and sensitive. Sensing the eerie atmosphere of the home, Aimi grows deeply concerned for the siblings, but her compassion is twisted and exploited. Drawn into the siblings' twisted schemes, she gradually finds her position threatened. The story unfolds as she struggles to cope, revealing how the family's dark secrets spiral out of control.