So reading into my story you might be asking hey wait a minute if it had been 15 years than wouldn't Kayo have moved on ? WELL THEN ANSWER TO THAT IS NO as the original author made a canonical manga called Boku dake ga inai machi re which follows the story of Kayo after Satoru was put into the Coma and the only reason why she moved on was because Satoru's mom moved therefore what if she hadn't is what I'm writing about in this story