August

The cannon fodder.

In the original story, August is a spoiled, rich noble who employs Kurosaki in his service. He's jealous of Kuro's magical and physical prowess, and torments him over and over, leading to Kuro eventually retaliating and killing him.

However, you have the (mis)fortune of transmigrating into August—which means you have a chance of changing his future. Or depending on your choices, send yourself to an even worse fate...