Aizo Shibasaki is a first-year student at Sakuragaoka High School and one half of the idol unit LIP×LIP. He maintains a polished, sociable public persona as an idol, appearing amiable and approachable during performances. Off-stage, however, he exhibits a more irritable and blunt personality, frequently snapping at others and preferring solitude; his speech patterns become notably rougher in private, creating a stark contrast to his professional image. Born February 22, Aizo's childhood was deeply affected by his parents' divorce. His mother, Yuko Shibasaki, initially displayed warmth but became neglectful and abusive afterward, frequently belittling him and failing to acknowledge his efforts to care for her during drunken episodes. This treatment fostered Aizo's general distrust of women. Though he retains affection for his mother, he conceals it. His relationship with his older brother Ken deteriorated post-divorce, as Aizo perceived Ken as sharing their mother's irresponsible traits. Despite ongoing tension and Aizo's outwardly rough demeanor toward Ken, he maintains underlying care, evidenced by his awkward yet sincere invitations to LIP×LIP concerts. Musical talent defined Aizo from childhood, leading him to pursue singing and guitar playing. He won awards for his vocal abilities before becoming an idol. His path crossed Yujiro Someya at an audition where both impressed scouts, resulting in LIP×LIP's formation. Initially, the pair clashed intensely, with Aizo frequently instigating arguments. Their dynamic shifted during pivotal bonding moments: Yujiro defended Aizo when older idols pushed him into a pool, and later, Aizo won a stuffed penguin at an aquarium tournament and gave it to Yujiro, who reciprocated with a keychain. These experiences forged a "healthy rivalry" and deep mutual reliance. Aizo later revealed a private park spot to Yujiro, symbolizing their growing trust, and acknowledged Yujiro as his most important person. Throughout their career, Aizo demonstrated fierce loyalty to Yujiro. During the "LOVE&KISS" musical production, he endured harsh treatment from a director primarily because Yujiro refused to quit, later ad-libbing performances to reinvigorate their partnership. When Yujiro collapsed from overwork, Aizo vowed to monitor his health vigilantly. Their professional collaborations often blurred into personal intimacy, such as Yujiro performing a private kabuki dance for Aizo and their staged kiss during "Meoto"—a song narratively paralleling their own journey from conflict to partnership. Aizo also prioritized Yujiro's feelings when considering solo opportunities, seeking reassurance before accepting them. His relationship with Hiyori Suzumi, their manager-in-training and classmate, began contentiously; he dismissed her as a "bumpkin" and silenced her harshly after she witnessed LIP×LIP's off-stage disputes. He gradually warmed to her, however, joining her for New Year shrine visits and supporting her romantic pursuits. He balanced idol duties with school life as part of the "Go-Home Club" alongside Yujiro. Aizo participated in promotional activities like serving as a tourism ambassador for Izumo City, expressing a connection to the locale through his producer's upbringing there. This role included virtual tours via the Sound AR™ app and an original voice comic featuring interactions with Hiyori and Nagisa Shiranami.