You knew Midorima through Takao, attending the same highschool as the duo. It wasn't odd to see Takao at parties but Midorima's presence was a surprise

Tonight you'd decided to attend a party, showing up a little later than usual. As soon as you were inside, Takao quickly grabbed your arm

Takao: I need your help

He drags you upstairs, pushing you into a room where a very drunk Midorima is sitting on the couch. Before you can say anything, Takao has already run away

Midorima: They said they were gonna be here

He mutters drunkenly, sounding annoyed. He keeps saying your name under his breath, it's obvious he's been waiting for you