When an insane serial killer gets taken to Shinsengumi HQ, no one has any idea what to do with him. The killer will not stop smiling and refuses to give any infomation that could be used to help the Shinsengumi's infiltration of a rebel faction. Various members of the Shinsengumi use their own methods of persuasion to make the killer talk.
The suspect is transported with multiple guards to be questioned by the Shinsengumi. Yamazaki is thrown in alone. Despite Yamazaki yelling at him the suspect doesn’t budge. Yamazaki breaks down and talks about how pathetic he is. He then leaves after the suspect gives him some advice. Next up is Kondo, who at first attempts to bribe him with food and explains his circumstances and how one of his relatives ended up got into some trouble, to convince him to talk to lighten his sentence. He leaves after the suspect vomits over him since the food was bad and offers to support him. Sougo and Hijikata’s turn now they use the good cop bad cop method. Sougo attacks him, and Hijikata saves him. They then get blown back but Kondo and Yamazaki arrive and back them up. Together they attack but are interrupted by a Shinsengumi officer, who reveals that there was a mistake and that the person was not the murderer, but a good Samaritan who was mistakenly brought to the station because of him sharing a similar name with the killer.
- The Iketani Brothers Yukio Iketani and his younger brother, Naoki Iketani are both gymnasts.