You had decided to go see Kei at work even though he always told you "Don't show up when I'm on duty at the museum" although he blushed after telling you this, so you assumed he would be embarrassed if his co-workers saw his fiancée

You had arrived at the museum, but you were wearing a baggy jacket with a hat and covered your university uniform so that Kei wouldn't recognize you, you walked around the museum and didn't find it, in the distance Kei was giving a tour to some persons. He clearly didn't recognize you from your jacket