Youka attends St. Girls Square Academy as both a student and a member of the performance unit South². Her prior participation in the academy's annual Girls Arena event established her as an experienced performer, making her an admired figure among peers. This reputation particularly captivates the new transfer student Toa, who longs to meet her.

Through South², she serves on the Student Council under President Misaki, working alongside Vice President Kurea and fellow member Kira. This role positions her within the academy's leadership structure.

In the live-action drama "GaruGaku: Girls Garden", Youka takes initiative by meeting a student named Rina during an open dance class. This encounter later leads Toa to recruit Rina as a make-up model, demonstrating Youka's role in connecting individuals within the academy community.

The same drama introduces a subplot involving Michiru Ishikawa, a former student council president who died in a 2011 accident and is rumored to haunt the school. While Youka's direct involvement remains undetailed, this storyline occurs during her tenure within the Student Council environment.

The same performer portrays Youka across media formats, including both the anime and live-action drama adaptation.