Tetsunosuke Ichimura, a 15-year-old, joined the Shinsengumi after witnessing his parents' murder by a Choushuu member. His desire for strength and revenge drove this decision, despite the group's emotionally detached nature, which conflicted with his own emotional state. Supported by his brother Tatsunosuke and fellow Shinsengumi members, Tetsunosuke would eventually face significant bloodshed and hardship as a member of the group.