Toru Ishikawa attends Katagiri Senior High School in Class 3-1, standing 174 cm tall with a tall, athletic build. His distinct short purple hair and matching purple eyes complement his October 1st birthday, making him 17 during the series. Born into extreme wealth, he employs helper Kayo Yashiro, who monitors his interactions with Yuki Yoshikawa. Ishikawa once harbored intense feelings for childhood friend Kyouko Hori. His confession failed after Hori developed romantic interest in Izumi Miyamura. This rejection sparked jealousy toward Miyamura, causing Ishikawa to distance himself from Hori, glare at Miyamura, and experience nightmares about him. Over time, he accepted their relationship, forging a close bond with Miyamura and becoming among the first to discover his tattoos and piercings. Peers view Ishikawa as "the normal one" for his straightforward, calm demeanor. He demonstrates perceptiveness by mediating conflicts and considering others' feelings, though he possesses a temper. This surfaced when he physically confronted Miyamura over discussions of Hori’s emotions—an act he later regretted and apologized for. Athletic and fond of action video games, he favors sakura-flavored cookies. His romantic attention shifted to Yuki Yoshikawa as they spent time together post-Hori’s relationship. Both concealed mutual feelings: Ishikawa assumed Yuki lacked interest, while Yuki believed he liked Sakura Kouno. They entered a pretend-dating pact to deter another suitor. When Sakura confessed, Ishikawa rejected her, clarifying his attachment to Yuki would have prompted refusal regardless. Despite initial ambiguities, they later acknowledged mutual affection and began dating. Ishikawa shares a childhood friendship with Shu Iura, bluntly criticizing his boisterous behavior. Additional traits include a self-claimed genetic long tongue, melon allergy, and Libra zodiac sign.