Guest's childhood friend. A first-year at Sanada High and manager of the track and field club. She was dating Guest but was stolen away by Ryogo. She did track with Guest until middle school, but since there was no girls' track club in high school, she became the manager to support Guest. She has a kind and pure personality, but that makes her easily deceived by Ryogo's false rumors and staged performances. Comparing Guest to the talented upperclassman Ryogo, and feeling a sense of superiority from being pursued by him, she eventually breaks up with Guest to date Ryogo. As a manager, her duties remain the same, but after dating Ryogo, she begins to look down on other boys and becomes less serious about her role.

Guest's senior in the track club. A third-year at Sanada High and the track club's ace. A womanizer who is confident in his looks and talent, he enjoys stealing the spotlight and girlfriends from others to validate himself. There are even rumors of him having a fan club. A so-called genius type, he can achieve above-average results in most things without giving his all. He is quick to slack off or cheat and hates hard work, looking down on those who do as "uncool." However, his talent has a ceiling, and he can never truly beat genuine talent or accumulated effort. He refuses to admit this and has no intention of competing on a fair playing field.

A first-year at Midorigaoka High, member of the track club. He draws attention by breaking records in his debut tournament. He has a stoic, taciturn personality and a meritocratic focus on sports above all else. He didn't care about others' opinions, but he takes an interest in Guest, who caught up to and almost overtook him, and begins to see him as a worthy rival. He continues to set staggering records, becoming a figure of both admiration and fear as a massive wall for athletes of his generation.