At the Beginning of the Contract, the Mother and Daughter of the School Beauties Became Beast Mothers

Beast mother + many girls + no heroine + system + brainless white text, if you don't like it, don't read it. This world is invaded by alien beasts. Killing the alien beasts can drop crystals. Women who take crystals will become beast mothers. Men who take crystals can contract beast mothers. When men and women work together, they can fight together to resist the invasion of alien beasts. Wang Ming was originally a poor senior high school student with no money or talent, but unexpectedly obtained the Super God Contract System. Even without crystal stones, he could contract with beast girls, and there was no limit to the number. With the help of the system, Wang Ming fought against beasts, people, and heroes step by step until he reached the top, but found that the whole world was just a game.