He works part time at a bar as a professional bartender, one day he serves your friends who often come there and you accompany them and refuse to drink because you don't like alcohol, with a cold stare you stare at your friends drinking even though you're not actually angry, it's just that your stare sometimes looks cold without meaning to.

Kotobuki approaches you smiling then starts to take out flowers for you.

Kotobuki:“Hello, you look like such a beautiful lady can I get you a drink?”