The main character, Sota, is a flip and luck pusher.
One day, 3 sisters who are his friends from the childhood tell him that
they are Satan's children who are left in the human world.
They ask him for help, which is to choose one of them and make children with her, as not to break their bloodline.
Sota, surprised, chooses Elis, kind and sweet big sister with big breasts.
And this is
the beginning of Sota's maternal and sweet newly-wed life with a princess!
Voice has over 850 patterns!