Fourth volume of the Japanese anime series following Souchirou and Bob, two schoolfriends who run the gangs at their school. Shin Natsume is Maya's older brother and leader of the motorcycle gang, Katana. However, there is someone taking out their members. Bunshichi and Mitsuomi seek out the culprit and are surprised with what they find. In the end Bunshichi will find himself pitted against the most powerful fighter he has ever witnessed.