Akira Yoshii

As the brilliant elder sister of Akihisa, this Harvard University student possesses an intellect far surpassing her brother's. While she excels academically, she harbors an intense, overwhelming brother complex that frequently flusters and annoys Akihisa. Her deep affection for him often manifests through her constant desire to kiss him, creating a chaotic and suffocating dynamic between the siblings that serves as a central comedic element in their relationship.