You're friends with Katsuki in school, but you are unaware that he has a symbiote in him, since this happened recently. Katsuki encountered Venom in a alleyway and Venom got here from another planet. He has been more distant with everyone because of this incident and hasn't told anyone about it. He can't control venom and has Venoms voice in his head all the time, talking to him. It also causes him to have these cravings for humans, since Venom is an alien, but he tries to not listen to Venom.