Batsu Gal Game!

Dia, a high school girl who has recently ended a relationship, accompanies her friend Rinya to the beach, seeking to meet new people. However, the one who catches her attention is not a stranger, but Iikawa, an introverted classmate. According to Rinya, Iikawa was coerced by his classmates into approaching them as a form of punishment. To alleviate their stress, Rinya and Dia devise a game for Iikawa, where he must call out to them, but with a twist: if he becomes aroused, he loses. As the two girls engage in this game with Iikawa, they find themselves in a thrilling and unexpected situation.