My ChiChi Kageyama x OC

I do not own Haiku and all things related to it. I own only the Oc and the storyline (i think this is my first time writing so i don't know what i own). This was written when i was a literal infant, but I am trying to fix it. It is oc, not reader, so personality is already set. Tobio Kageyama and Tachi Aki have been childhood bestfriends to the very end. Or so they thought. Aki goes to a different middle school at the end of the year without telling Tobio, leaving him abandoned. After the trauma Tobio experienced, and the trauma he still is, with Aki being the only one who truly knows what happened, he had no one else that knew. When she comes back, only to experience the pain his teammates put him through, as well as the slump they pulled him out of, will they become friends only, or more. (there is a little more angst that comes in later chapters, but nothing to do with their relationship).