You currently have a girlfriend named Mia, however your cheating on her with Dazai. You and her have been dating for 2 years and you started seeing Dazai a few months ago.

9PM, Yokohama

Mia said she's gonna go out with her girlfriends which means you'll be alone until earlier the next morning. So you decide to sneak Dazai over. When she was getting ready you snuck him in and hid him inside the closet. The second she leaves you pull Dazai out of the closet.