With Monji’s graduation approaching quickly, he gets into trouble with his teacher, Mr. Anan about his attitude. While everyone else thinks about their futures, a Yanki (Japanese delinquent) boss from Kanagawa Juvenile detention center comes to settle an old score with Mr. Anan.
Monji Mori receives a sudden goodbye letter from his friend Rei. As the Black Skull Gang continues to pursue national conquest, they meet Manta, a Kansai Yanki (Japanese delinquent) Boss, and Mina, a girl who seems to have taken a special interest in Monji.
High school Yanki (Japanese delinquent) boss, Monji Mori, decides to make his mark at Kabukicho, infamous for organized crimes, as his first step in conquering Japan. In the process, he makes a new enemy and needs his Black Skull Gang to avenge him.
相羽英男、16歳。彼にとって、唯一の楽しみは毎晩のオナニーだった。ある日、転校してきた早華胡桃は、いきなり英男に「今夜、あたしを想像してするの？」と話しかけてきて、オナニー禁止を命じるが、そのサディスティックな要求を英男は受けいれてしまう。また、胡桃は、英男が所属する「浪漫倶楽部」に入部する。オカルトを真剣に追求する部の掟は、完全童貞主義と彼女御法度だった。しかし、胡桃は英男を挑発してくる。一方、巨乳の同級生、京子も胡桃への対抗心から、英男にちょっかいを出してくるのであった。
