Neiko Futaba is the perfect school idol—beautiful, admired, and seemingly flawless. But behind closed doors, she reveals her true colors: a hopelessly clingy sister who showers her younger twin brother, Otohiro, with relentless affection. Whether it’s teasing him, trying to seduce him, or just getting way too close for comfort, Neiko’s antics turn Otohiro’s everyday life into a constant struggle for peace (and sanity)!