Because of his extremely violent nature and his nickname "The Demon of the Sakuragi Family," the first lieutenant of the Sakuragi Family, Kirishima Toru, is feared by the rest of the yakuza world. One day, Kirishima is summoned by the head of the Sakuragi Family and is tasked with taking care of his only daughter, Sakuragi Yaeka. But Yaeka is very shy and doesn't really open up to him, which perplexes Kirishima. He then finds a notice about an open house that Yaeka's class is having, and it happens to be that day. Then Kirishima...