Yasumoto is a senior employee with extensive experience at Komada Distillery. When a confrontation arises between Kōtarō Takahashi and Rui Komada, Yasumoto intervenes. He recounts the Komada family history to Kōtarō, revealing that Rui's older brother, Kei Komada, was originally destined to inherit the distillery. Kei departed after a disagreement with their father following an earthquake that damaged equipment and halted production of their signature whisky, Koma. Yasumoto further explains that Rui abandoned her own aspirations as an art student to assume control of the distillery, believing whisky embodied essential family bonds. His explanation provides key background on the family conflict and Rui's motivations for reviving Koma. This intervention helps Kōtarō grasp the distillery's deeper significance and Rui's dedication. Yasumoto's actions demonstrate his knowledge and his role in facilitating understanding between characters.