Satoshi Sugimoto, a minor character, attended elementary school with Momoko Sudō and maintains acquaintance during high school. Though enrolled at different schools, both share attendance at the same preparatory academy. They briefly engaged in a youthful dating experience before Momoko recognized her sexuality, anchoring their shared history. His height measures 166 cm. The name Satoshi signifies "enlightenment" (悟), while Sugimoto derives from "cedar" (杉) and "base" (本). His narrative function centers on this past connection with Momoko, serving her background development.