In a modern teahouse nestled in a mountainous tourist area, Kensuke and Ryuji live together and run the business jointly. Kensuke is mainly in charge of the tea and sweets, while Ryuji manages the overall operations and business affairs. Ryuji is deeply fascinated by Kensuke’s unusual hobby—preparing dishes using poisonous ingredients.

One evening, exactly one year after the teahouse’s opening, Maeno, who works at a nearby inn, and Miyaguchi, the owner of an Orgnic restaurant, visit the shop after closing hours. There, they discover the peculiar hobby that Ryuji has long been captivated by. The three begin trying to persuade Kensuke to share his passion with a wider audience.