Seiichi Natsume owns a stylish flower shop called "mellow". Unmarried and girlfriend-less, he loves working with flowers and leads a peaceful life. After transferring to a new elementary school, his nephew Saho often stays home and misses classes. One day, Saho's mother, Natsume's big sister, shows up and leaves Saho in his care. There is a ramen noodle shop in the neighborhood where Natsume sometimes takes Saho. It is run by Kiho, a young woman who inherited the shop from her late father and who has Natsume provide flowers for the altar at her house. Hiromi, one of mellow's regular customers whose family owns a beauty salon nearby, has a secret crush on Natsume. As Natsume diligently runs his flower shop and serves its various customers, Mariko, another regular customer and a housewife, confesses her love for him. Right in front of her husband... Natsume finds himself enmeshed in other people's affairs of the heart, but his own thoughts are....