As Ookido Yuu begins middle school, her height makes her quite noticeable. Although she isn't particularly skilled in sports, several classmates encourage her to join their athletic clubs. Among them is her childhood friend Ken-chan, who keeps urging her to try out for the Kendo club despite Yuu's reluctance. She's discouraged by her inability to outdo Ken-chan in any kind of competition, which is why she's not interested in Kendo.