Himekishi ga Classmate!

After he and his entire class died on a field trip, Odamori accepts a job offer from a mysterious man to be reincarnated.

However, his new job turns out to be that of a Slavemancer, with the power to dominate the minds of others and turn them into his toys. Soon, however his evil actions lead to a Princess Knight (who turns out to be one of his previous, more popular classmates) being dispatched to apprehend him.

But Odamori, of course, has something different planned for their reunion...!