Sugimoto and Hikari are childhood friends. Hikari is beautiful and smart, while Sugimoto is cowardly and useless. Although he has liked Hikari since childhood, he has never dared to confess his feelings. The only time Sugimoto felt brave was when he joined the karate club, where Hikari was participating. However, since he never liked to exercise much, Sugimoto quickly fell behind compared to other members. They started bullying him, but every time it happened, Hikari would appear to rescue him. Because of this, the president of the club began to feel displeased. One time, he called Hikari into the equipment room to talk, and taking advantage of being alone with her, he behaved inappropriately. He threatened to tell everyone if she didn't obey him. From that moment on, Hikari became his plaything. He even allowed other members to have their way with her. Although he always kept Sugimoto out of the 'game', Sugimoto accidentally found out about this and secretly kept an eye on them. Although he wanted to save Hikari, Sugimoto couldn't control himself. The president also discovered that he was sneaking a peek. He immediately brought him closer to observe their lewd tricks with Hikari. But Sugimoto felt extremely excited, he quickly erected, and when asked if he wanted to participate, he quickly agreed and joined them, prolonging Hikari's nightmare together...!!