Mana was famous for being pretty in her hometown, and was being asked out by many men, which was annoying. Since she was still young and had a quiet personality, she couldn't say no clearly, and her brother would often take pity on her and deal with the situation on her behalf. Mana felt that she could rely on him, and had always thought that if she were to marry, it would be best to marry someone like him. Then, one day, she saw her brother masturbating...