A high school sophomore who is also a young swordsman and has moved away from his mountain life to live with the Ikaruga family in the city. He is a very active person who actively enjoys martial arts with swordsmanship in particular. Due to his early childhood in the mountains with his father, he does not know the current customs in Japan or to act around a girl. He is very honourable, which is shown when he addresses everyone with the -dono honorific. However, due to constant misunderstandings, Ibuki, in particular, constantly attacks him under the assumption that he had done something perverted. He is usually seen wearing a Japanese martial arts uniform and a wooden sword. He is a freeloader at Ikaruga Dojo and is a student of the Ukiha Kamikaze Swordplay (Soaring Wind, Divine Wind Style). He attends the private school Yoku-Ryou Gakuen with Ibuki and Ayame, and he's in the same class as Ibuki and Washizu. He recently was forced to join the Acting Club, and was initially paired with Ibuki to play the main hero and heroine of a love-play. But Ayame took over Ibuki's role afterwards, so she could get closer to Yoichi. He always gets nosebleeds after doing or seeing something perverted, usually the latter. It is hinted that he has feelings for Ibuki.