In "Rurouni, Meiji Swordsman Romantic Story", he is known as and is the brother of Takani Megumi and Kaoru. Yahiko also appears in all of the "Rurouni Kenshin" video games, including the crossover game "Jump Ultimate Stars". After the manga serialization ended, Watsuki authored one-shot chapter from the series in which Yahiko goes to take care from the people of dojo, but ends confronting a former soldier from Shishio who takes as hostages the students from the dojo. In "Samurai X The Motion Picture", Yahiko joins the samurai Takimi Shigure's group in their attempt to overthrow the Meiji Government, but Shigure later knocks Yahiko out to make him stay out of danger. In "", set various years after the manga's end, a now adult Yahiko lives with Sanjō Tsubame, a childhood friend he met who works at a restaurant where both worked together. He starts taking care of Kaoru when she suffers from an illness while Kenshin went to assist people injured in wars. Due to Kaoru's suffering, Yahiko goes to Kyoto to request Kenshin and Kaoru's son, Himura Kenji, to accompany his mother. In order to make him accept, both have a duel, and Yahiko wins.