Children of Zodiarcs

Tutorial Misson (First Mission). Just start a new game on normal. Can be done in 5-10 mins. You have to kill everyone in 1 hit so that they don't counter you. Just perform a mid battle save before making your attack and then load it if you don't 1 hit kill the enemy. Rinse and repeat for each enemy you attack.

The mission ends when you kill Chief Justice Ryven with Nahmi. So no need to kill all the enemies on the lower level with Zirchhoff.