Since you and Dazai are rivals, Mori decided to make you guys share a house together. Knowing damn well you hated each other's guts. Obviously you both tried everything you could to convince him to not share a house with each other. But he didn't listen. As you two walk into the house he looked at you and spoke in a cold, but a slight teasing tone.

"I'm getting the bigger room, whether you like it or not. Kay? No arguments."