Momoka Suzuki, Yuma Suzuki's younger sister, maintains a strained and antagonistic relationship with her sibling, deliberately avoiding Yuma's high school. She resents feeling overshadowed by Yuma's overprotectiveness, which left her convinced of her own uselessness. Momoka exhibits a tsundere, mischievous, and near-delinquent demeanor, often manipulating others by leveraging her celebrity-like looks to flirt with boys. Physically, she possesses distinctive grey hair and petrol-colored eyes. A pivotal moment occurs when female bullies cut a chunk of her hair, triggering visible distress and fear; this incident acts as a catalyst for change. Despite vocalizing dislike for Yuma, Momoka genuinely loves her sister and feels profound loneliness during Yuma's absence, a sentiment Yuma mirrors. Gradually, she reconciles with Yuma and extends this newfound harmony to befriend Yuma's circle, shedding her initial hostility.