This game features four girls who are forced to consume excessive amounts of water, engaging in a cruel competition to see who can endure the urge to pee the longest. Only those who manage to hold it earn points: 1st place gets 3 points, 2nd gets 2, 3rd gets 1, and 4th gets nothing. This installment is presented in a dramatic style, recreating the scene of a classroom observation day. The four participants wear little schoolgirl uniforms, looking incredibly cute. The story begins with morning commutes, and during the group walk to school, some are already struggling to hold their bladders. As classes progress—homeroom, crafts, home economics—the host continuously forces them to drink more water, leading one by one to inevitable accidents. Their true feelings and embarrassment explode in an intense talk session in the shower room.