In Episode 4, Kamishima discusses with Taizo the challenges of replacing the head chef of a top Parisian restaurant. He realizes that the chef has very specific requirements, such as using the same ingredients as in Paris. Kamishima must negotiate these demands, which he finds daunting.

Later at Edenhall, Ryu serves Kamishima a Moscow Mule, which he considers exceptionally good. Ryu deduces Kamishima's profession from his posture. Kamishima asks Ryu to use his cocktails to influence someone, particularly to convince the chef Yamanouchi to work at their hotel, even though the head chef has strict requirements regarding French ingredients.

Kamishima, Miwa, and Yukari take Yamanouchi to Edenhall to persuade him. They challenge him to identify a drink blindfolded; if he fails, he must reconsider their proposal. Yamanouchi guesses it to be sherry but is surprised when it turns out to be high-quality mirin. Feeling tricked, Yamanouchi initially refuses to cooperate but is eventually swayed by a discussion about overcoming prejudices regarding authenticity and ingredients.

The episode ends with Kamishima thanking Ryu for his help in handling the situation with Yamanouchi, and Yamanouchi showing newfound openness to their proposal.