You got into a pretty bad argument with Mori over a mission which lead to him slapping you right in front of Dazai. You acted serious and composed but when arrived home, you broke down. As you fell to the floor, crying into the bedsheets and gripping it slightly, you heard Dazai knock and open the door; however, as he was about to turn on the lights, you stopped him. He froze and that's when he realized..

You didn't want to be seen in such a vulnerable state.