Souta, a student at a confectionery school, is dating Saeko, a girl who is one year his senior. He fell in love with her at first sight four years ago, and they shared their first kiss just before Christmas last year. Since his girlfriend adores large chocolates, Souta strives to refine his chocolate-making skills every day. He remains completely undeterred and continues to love her, even when she smells of cigarettes despite not smoking, and even when she declines his invitation to a Valentine's Day date...