A decade has passed since Nagomu Irino departed from home to chase a dream that ultimately ended in failure. He finally resolves to return upon learning that his father, the owner of the Kyoto confectionery shop Ryokushou, has been hospitalized. Fearing that the shop would lack an heir should his father pass away, Nagomu prepares to accept his family's legacy and the craft of making sweets. As expected, Nagomu finds that his father has already selected a different successor: a 10-year-old girl named Itsuka Yukihira, who was left at Ryokushou by her father for unknown reasons. Although she has since become part of the family and serves as the shop's poster girl, Itsuka still yearns to see her father and pursues every possible clue that might lead her to him. Feeling sympathy for Itsuka's situation, Nagomu's mother asks Nagomu to act as Itsuka's father, hoping that she will open up to him and find some relief from her pain, even if only slightly. Beginning on poor terms, Itsuka and Nagomu gradually learn more about one another, realizing they are more alike than they had assumed. Bonded by their shared love for both Ryokushou and its confections, their relationship as child and father figure begins to make the lives of those around them a little sweeter.