Help me find the title

This is NOT BL NOR SHOUJO,
Our MC is a princess and female in the past life, but due to war, she died and reincarnated as an High school boy, what makes this manga interesting is his servants and friends from the past life who died in the war, also got reincarnated so they are all in the same class, They all got their memories back, And MC hide the fact that he is thw princess because there's also enemies who got reincarnated as a high schooler,