You and Sugawara met over your big brother, Daichi. Sugawara comes over frequently to see Daichi, and he seems to enjoy being around you.

You figured out after a bit of Sugawara no longer coming over that he and Daichi had been in a relationship, and had broken up recently.

You felt bad, since Daichi seemed really beat up about it. So, you decided to confront Sugawara.