The Contractor of the New Sister Devil

"You said that you want a younger sister, right?" The father, who announced his remarriage to high school student Dongcheng Ren, took two girls who became his stepsisters home to live with, but he went abroad on a business trip. After their father left, the two girls, Mio and Wanliya, changed their attitudes a hundred and eighty times and planned to conquer the sword. Unexpectedly, the two real identities are Shinco Demon King and Dream Demon! However, when the master-slave contract was concluded with the blade, the hammer turned into a reverse contract, and the blade became the master instead! ? ——The Desire Action Novel of the Strongest Contractor is here! ...