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. Manga Adaptation of the Light Novel by the same name.