The story centers around a short 15-year-old boy named Ichimura Tetsunosuke who attempts to join the legendary samurai of Shinsengumi as part of his plan to avenge his murdered parents. However, he learns that he must become a demon to join this group.
- Suga Kenta as Ichimura Tetsunosuke
- Furukawa Yuta as Ichimura Tatsunosuke
- Yanagishita Tomo as Okita Soji
- Izaki Yusuke (伊崎右典) as Harada Sanosuke
- Araki Hirofumi as Yoshida Toshimaro
- Nakajima Airi (中島愛里) as Akesato