High School Prodigies Have It Easy Even in Another World!, Vol. 12 (manga)

After turning the tables on the Yamato dominion’s overwhelmingly more powerful
forces, the high school prodigies press their advantage all the way to the inner
defenses of their enemy’s stronghold, Azuchi Castle. In a desperate, last-ditch effort to
win a battle that appears all but already lost, the cornered Princess Mayoi unleashes
her brainwashing magic once more. As the fighting spirals out of anyone’s control,
Mayoi’s tragic past and the great, terrible secret of Yamato’s history will be revealed...