Gakkou no Kaidan

Yukihiro Kanba, a new student at Tengurihama Academy, is taken in by his uncle. During his first days, he encounters Yuuko Kokonoe, who runs past him and vanishes quickly. Later, while visiting the gymnastics club, Yukihiro is approached for recruitment but is redirected by Yuuko to an unofficial club focused on stair racing. Despite the club's poor reputation, Yukihiro eventually finds the activity exciting and chooses to become a member.