"I wonder if my pubic hair is thick." Tsumugi, a childhood friend whom he secretly has a crush on, suddenly comes to him for advice, and he ends up looking at her genitals in the classroom after school. From that day on, his mind is filled with thoughts of her, but Tsumugi starts dating a senior. Then, one day, he witnesses the senior and Tsumugi having an affair, and in the midst of his sadness, an unexpected turn of events takes place...