Evenicle

The creator of the world, the Holy Mother Eve, gave two commandments: one must not kill another human, and one must only have one partner for life. However, knights are exempted from the latter divine rule, so that they can produce powerful offspring to fight against monsters. Somewhere in the land, there was a young man Asterisk who wished to marry the beautiful twin sisters who raised him. He decided that he will become a knight and get lots of wives! Thus, he set out on his journey with great enthusiasm and ambition.

[From Hau~ Omochikaeri!]