A man returning home. - There is a letter on his table, and it seems that his parents will be away for three days. - A man heading to his room, where his sister returns home. - There are only two of her brother and sister in her house. - The older brother who attacks her sister without telling her is restraining her sisters limbs and muttering, Finally a chance has come .... - Apparently he had been asking for a chance to be alone with his sister for some time. - Her younger sister shouted in a frightened voice, Whats this ... - He spends the night in detention, and the next day his brother continues to commit her sister ...