Setsuna Kiyoura is an ordinary high school student spending her summer vacation with family and friends. When her close friend, Sekai Saionji, becomes bedridden with a common cold and cannot work her part-time waitress shift at Radish, the family restaurant, Setsuna decides to cover for her until Sekai recovers. Although she discovers the job is slightly more demanding and stressful than anticipated, she befriends several acquaintances at work, becoming particularly infatuated with fellow student and customer Makoto Itou.