Tatsuya Iguchi, a legendary delinquent feared as the "Mad Dog of Komae," is released from juvenile detention. He starts a new life working at a yakiniku (grilled meat) restaurant called "Sanrui," located far away from his hometown, under the care of his uncle and aunt. However, Tatsuya is under probation, and if he gets into another fight, he's out. In front of him appears Kaname Abe, the vice leader of the biker gang "Zanjin Kirihito." This encounter marks the beginning of Tatsuya's intense journey toward rehabilitation. As he faces gang conflicts, forms new friendships and bonds with his newfound companions and family, the path Tatsuya must take to protect what's important to him unfolds.
Students, including Aoi Nishino, take part in class and sports activity at a prestigious high school. Aoi Nishino is a member of the school's archery club. He practices archery studiously and doesn't socialize much with the other students. His childhood friend Haruka Seno is also a member of the archery club, but she worries about Aoi Nishino. One day, thunder strikes the school grounds. After that, the ordinary lives of the students changes drastically. Many samurai descend on the school grounds. It appears that the entire school has traveled back in time to the Sengoku period. Making things worse, they realize that they are in the time right before the Battle of Okehazama takes place.
