Living a solitary life in his apartment, quiet Kai develops an intense secret obsession with watching his alluring neighbor Ikenaga. He peeks through his window almost every day, mesmerized as she casually undresses and masturbates, using the sight to satisfy his own urges. When their paths unexpectedly cross one morning, it ignites a night of wild, passionate sex. Kai is still processing how his hidden voyeurism has suddenly become real, sweaty encounters with the woman he admired from afar.