He is the school nurse and had wanted to become a doctor. Iku's sister, Yui, had feelings for him, but after her death, he blamed himself for not being able to save her. His father is the chairman of the academy, but after his retirement, the position was given to Kotarou's sister, Koharu. However, he ended up obtaining the position due to Koharu's wish to work overseas.
Source from Wikipeida