Synopsis: Zetsurin Kenja to Himitsu no Keiyaku

A world where people live in fear of demonic beasts. The people of the family who own it are called magical aristocrats, and they were able to use 'Magic' to destroy magical beasts. Married to Marquis Ethan and confined in the basement I should have been beaten to death. ...But before I knew it, I was back on the day my engagement was decided. In order to avoid the same future, Stella ran away from home and met Lou in the forest. Meet Cass. Although he is the son of Earl Bradley, he was said to be ``incompetent'' because he could not use magic, and was rumored to be ``impossible'' because his body did not react to any woman. Lucas can't recover his magical power on his own, but when he touches Stella, he recovers a little of his magical power, which no matter what he did until now. In order for Lucas to recover his magical powers and for Stella to be free, the two are to enter into a one-year contract marriage. To.... However, each time they come into contact with each other, they become attracted to each other, and finally cross the line. Then, Lucas, who has greatly recovered his magical power, awakens to his true power.