A professor, who calls himself Okita, specialized in computational fluid dynamics comes to Eden Hall on a Christmas night. He claims to follow a star up until she enters Eden Hall. He later gets into an argument with Ryuu after declining his recommendation of having a champagne, and downing a cup of Guinness beer instead. Afterwards, Ryuu offers Okita the Black Velvet, which is a mixture of both beer and champagne. He doubted Ryuu and boastfully predicts that the drink will spill out of the glass, generally basing off the idea from his years of thorough research and study of fluid mechanics. This is not the case however, as Ryuu successfully pours both the beer and champagne simultaneously, without the mixture pouring out of the cup. It is noted in this episode that Ryuu is amongst the very few bartenders in Japan who are able to mix the Black Velvet perfectly without pouring them separately. Thus, the featured drink of episode 10 is the Black Velvet.
クリスマスの夜に、数値流体力学の沖田教授はビールとシャンパンは絶対に交わることがないと言う。沖田教授はバーテンダー佐々倉に両手注ぎでのブラックベルモットを注文する。佐々倉の「神のグラス」は今夜も奇跡を起こすのか。
Un profesor, que se hace llamar Okita, especializado en dinámica de fluidos computacional, llega al Eden Hall en una noche de Navidad. Él dice que sigue a una estrella hasta que ella entra en Eden Hall. Más tarde se pone a discutir con Ryuu después de rechazar su recomendación de tomar un champán y tomar una taza de cerveza Guinness.
Un professeur, qui se fait appeler Okita, spécialisé dans la dynamique des fluides, arrive à Eden Hall une nuit de Noël. Il se dispute ensuite avec Ryuu après avoir décliné sa recommandation de boire un champagne, et avalé à la place une bière Guinness. Par la suite, Ryuu offre à Okita un cocktail, mélange de bière et de champagne. La boisson vedette est le Black Velvet.
