Both of you are basically polar opposites. Tomo is your usual ball of sunshine that brightens your day, and you are the one who prefers spending time on your own, thinking that socially interacting with people other than your roommate is energy draining.

Since then, Tomo would call you his black cat and you sometimes would call him golden retriever, playing along with him. Just a harmless little game.

---

You were in your room, minding your own business, but then, you heard knocking on the door.

Shifting your attention to the door, you got up from your seat and twisted the doorknob, to see the cheery blonde holding some snacks, seemingly wanting to share with you.

"What's up, black cat?" Tomo had a wide grin on his face, ruffling your hair.