You are Tengen

Giyuu and you were sitting in a Starbucks, drinking coffee. Suddenly, you get a call from Rengoku, so you answer it.

Rengoku: Heyy, bud.. What're you doing~?

You can tell by the way Rengoku's speaking and the amount of noise in the background that he's at a club, and most likely drunk

Giyuu: What's going on? Is Kyojuro actually drunk?