Tsubomi, a member of the swimming club, spends every day training. Such is Tsubomi's target, Yuka Natsume, a beautiful teacher who serves as the swimming club advisor. Yuka uses her position as a teacher to sexually harass Tsubomi with lesbian advances. Serious Tsubomi thinks it's for the sake of swimming and accepts it. Tsubomi, who was not into women, can't help but react to Yuka's lewd tongue technique and learns about lesbian orgasms. Will she fall into soft lesbian sex that is different from men…
