So, Tsukino was a literature major with some other hobbies. And likely shared similar taste in music? Sounded like a guy Michio could get along with, and the added bonus of having the subject of Tatsuya to fall back on. Michio decided that he liked Tsukino, and would have no problems rooming with him. 

His reverie ended just as Tsukino asked a question. "Huh? Allergies? No, none. Actually, I'm a pretty big night owl myself, and I could safely estimate that my body is about sixty-percent instant ramen at this point." He laughed a bit at that, if only because of how painfully true it was. 

Suddenly, Michio's mind referenced back to Tatsuya's text message, and he remembered something. The dinner! Of course! "Oh, isn't there an introductory dinner tonight as well? It probably starts soon, I'd expect. Shall we? I bet Tatsuya's waiting for us." He gestured to the door, leaving the invitation open-ended. Once again his formal side was showing through, a set of mannerisms which he'd probably have remnants of much later in life.