please help find this manga!!

i dont recall the title or any of the characters name but i do remember that the mc wakes up with amnesia and is told that hes a well-known hero and he has to fight to save the city when in reality the actual hero's whereabouts are unknown and hes a villain (or at least im pretty sure he is) he ends up believing them thinking he is the famous heroooo
i dont think it has an anime and it had fighting scenes tooo i swear this exists im not delusional