|Light Novel||Yahari Ore no Seishun Rom-Com wa Machigatteiru.|
Yui is a cheerful, outgoing girl who becomes the Service Club's first "customer", asking them to help her bake cookies for "a certain someone". Her problems lie not with her personality, but with her inability to deal with issues by herself. She believes that talent is inborn, and often aspired to be like others until Yukino changed her way of thinking. Following her experience with the Service Club, Yui begins to attend Service Club sessions after school as well, despite Yukino's objections early on.
Source: Yahari Wiki