Tomoe Koga, a first-year high school student, battles deep-seated insecurities rooted in her self-conscious transition from a self-proclaimed Fukuoka "bumpkin" to a Tokyoite determined to evade social ridicule. To erase her provincial past, she meticulously crafts a polished persona—salon-styled beige-blonde bob-cut hair secured with a T-shaped barrette, trendy outfits, and flawlessly adopted standard Japanese—while obsessively monitoring peer dynamics via her phone. Her Adolescence Syndrome, sparked by subconscious discontent, grants her the power to replay and reset days. This ability first surfaces during a paralyzing social quandary: trapped in a June 27 time loop after struggling to reject a classmate’s confession without alienating friends, she recruits Sakuta Azusagawa to pose as her boyfriend. Their fabricated romance unfolds through orchestrated dates—aquarium visits, beach outings—designed to shield her social status. As simulations intensify, genuine affection for Sakuta triggers repeated July 18 loops. Each cycle culminates in her heartfelt confession, only to collapse when Sakuta reaffirms loyalty to another, restarting the day. The loops cease when she confronts her emotions, embraces rejection, and resets time to June 27. Here, she confidently declines the initial confession, shedding her fixation on peer approval. Petite in stature with curves often noted by peers, Tomoe balances a sunny disposition against idiosyncratic ethics, demanding equal physical retaliation for perceived slights. Her evolution from fearing ostracization to asserting boundaries highlights her growth, culminating in authentic friendships freed from performative social maneuvering.