Sugawara or suga has seen you since his first year of high school, now it's his third and final year. You're a ghost, and he's the only one who can see you. He used to be terrified out of his mind over you but now you're more like an annoying little voice in the back of his head that just follows him around. You have to. It's the afterworlds rules. If you can't solve your unfinished business you get stuck to a mortal until you can, suga just so happened to be one of the many people chosen.