HMN-726 My cousin, who I used to play with as a child, came to visit the countryside for the first time in five years, and I was surprised to see how much she had grown. During one week of summer vacation, we spent our time together in the heat. Suzunoya Rin

Because of her parents’ work, Rin, Yuzuru’s cousin, moved to Tokyo five years ago. For one week during the summer, she stays at Yuzuru’s house. Yuzuru is two years older than Rin and has always been like an older brother to her. When they were little, they often played together, catching insects and doing other childhood activities.

With Yuzuru’s parents also away at part-time jobs, Rin and Yuzuru reunite after a long time. Yuzuru had still thought of Rin as a child, but she has grown into a cute young woman. Yuzuru, who has long been preoccupied with self-pleasure, accidentally sees Rin naked in the bath and finds himself unable to control his arousal.