Sorcery in war (A MHA X JJK story)

This takes place during the "vigilante deku" arc or wtv it was called and y/n was chosen by the USA government to go help Japan to stop shigaraki / AFO from killing everyone. When Y saw the battle between Class 1-A and vigilante "Deku" he stops the fight and gets everyone's minds straight and stop the war

(I haven't read that specific part of the manga in a while so sorry if some things are wrong...) (this is also gonna start there and end at the end of the series)