In the romantic Sapporo Shiroi Koibito Park, a mysterious case about the "old chocolate recipe" quietly unfolded. The young detective team followed the aroma of chocolate, but found that the precious old chocolate recipe was missing from the carved iron box with "1978" engraved in the workshop.
As the investigation deepens, apprentice Ryota, Misaki from the dessert shop next door, and Takuma's grandson Takuya become suspects. The detective team divided into multiple routes, from Misaki's dessert shop to the workshop warehouse, and then to the lemon grove next to the toy museum, to uncover the truth step by step. It turns out that everyone pieced together this lost recipe in their own way with their friendship for Mr. Fujii and his old partner Takuma.
In the process of searching, everyone's thoughts gradually emerge, misunderstandings are resolved, and warmth and touch permeate the sweet fragrance of chocolate. In the end, everyone completed the recipe together, not only regaining the taste of thirty years ago, but also allowing this precious memory to continue. And their journey is still continuing. At the next stop, Otaru, there is a new recipe waiting for them to explore.
