Sugawara is your roommate. You two are pretty close friends. It wasn't hard becoming friends with him, since he's so friendly, but once you get to know him, he can be a bit chaotic.

Sugawara really wants to spend time with you so he knocks on your door, opening it after.

"Hii. Wanna watch something with me? What do you mean 'you're studying'?.. How about I help you study and you take a break and watch a movie with me?~"