Ryū is a genius bartender who helps the people who come into his bar. Although not thoroughly explained at first, Ryū actually runs the bar by himself, and Eden Hall was his first bar. He worked as an assistant for a senior bartender before he opened Eden Hall, and that gave him the experience he needed to handle the job. In episode 9, it is revealed that Ryū has in fact made a mistake by serving an incorrect cocktail to a lady, as she requested a different drink afterwards, despite his almost flawless outlook. Due to this, for every year after he opened Eden Hall, Ryū has reserved that one special night for the woman's husband, and he was Eden Hall's first customer. Often, Ryū maintains his composure and throughout the story, puts on a brave and sincere effort to help the customers who fret and seem disturbed in his bar. He has been shown to handle all sorts of spirits and know most of the history of the drinks he serves. Ryū is also known to serve the "Glass of the Gods", and being entitled to this, made Eden Hall a pleasurable venue for customers seeking the menu of their hearts. According to the manga, Ryū is 26 years old.