黒沢 琉

sótano’s head bartender and pianist. He can handle just about any situation smoothly. 

His customer service is flawless, and at first glance he seems like an amicable intellectual; but in reality he’s a neurotic, anti-social young man with a propensity for obsessing over cleanliness. He’s also selfish, prideful, and quick to anger. The fact that Haru is annoying, stupid, and completely lacking in tact makes Ryu hate him at first sight. 
He values efficiency above all and doesn’t concern himself with appearances more than he needs to, so there’s a visible difference between his ’on’ and ’off’ modes. 

”Get out of my sight.” 

MangaGamer