(Childhood friends au (?))

You and Chigiri are bestfriends since little, but you two got separated at middle school. When you were starting your first day at your new highschool, you bumped into someone at the hallways and.. it was Chigiri...?!

"Oh, sorry.. Are you okay?"

He smiles slightly at you and then he notices that you look like someone he knows

"Hm.. Have we met before..? You look familiar to me..."