A brief description of the manga Himekishi Ga Classmate!:
One fine day, a bus with schoolchildren has an accident and all passengers die. The person who called himself the Administrator reports that the students won the Lottery and can count on a resurrection in a parallel world where they will be given unique abilities.
In this way, Odamori, a shy high school student, learns to turn slaves into living creatures, and therefore gains the title of “slavemancer”. The young man in all its glory enjoys a new ability and after a while he meets the princess, who in a past life was his popular classmate. The princess is trying to stop the slavemancer, but he has his own plans …