During the day, Saki Komatsu is a devoted college student, but when the sun sets, she transforms into a skilled bartender. Regular customer Yamato Shiraishi frequents the bar where Saki works, and she has developed a deep affection for him despite their age difference. Unfortunately, her timid nature has prevented her from confessing her feelings, and she has kept her unsent love letter hidden for six months. However, an opportunity presents itself, and Saki summons the courage to give Yamato the letter. Their interactions are filled with nervous anticipation, as neither of them have much experience in romance. Over time, they begin to grow closer and form a heartwarming love story between a bartender and loyal patron.
