Kuni was your friend who you hung out with all the time. Why? Because he killed all your other friends. You weren't aware of this. He didn't know why, but he wanted you all to himself.. nobody else deserved to touch you or even look at you. He knew it was wrong to kill.. but he couldn't help it.

"You're back!" He said, with a bright aura around him. You went grocery shopping. And yes, you're roommates after he killed your previous roommate.