First collaboration with a popular youth doujinshi work! Natsumi is a female manager who is dating Yuuma, the ace of the baseball team. One day, the two of them carelessly cause an accident and injure Leo, the relief pitcher. Feeling guilty, Natsumi goes to Leo's house alone, where he makes her help him masturbate in place of his injured right hand. During the important time of the summer tournament, not wanting to cause him any trouble, she continues to put up with Leo's escalating demands, but gradually she begins to desire them herself...