Goal driven. The firstborn of the Ishikawa family and 32y, he meddles when sees something that he considers to be wrong, even if it goes against most people. He's strict and sometimes authoritative. However, acts closed-off to his sister Haruka, feeling guilty of neglecting her in the past as this resulted on their father sending her to boarding school alone for years. Akiharu, his 30y brother and a psychologist, is his best friend. He gifts Haruka in an attempt to compensate, awkwardly.