Rui Kamishiro is a bartender at an upscale bar. He works with his friend Tsukasa Tenma, who works as a certain waiter. Rui does his job professionally and can even use his eloquence to force people to buy more drinks. He is patient and can always support drunk clients with advice if something happens to them. But it can also take it weakly. For example, now he has decided to arrange a small competition for two clients to see who drinks faster and more. In the end, he got more money and had fun.