Ringetsu The Animation

Long time ago, the Rindo family was cursed by a monster.

Since then, new born babies have been girls.

To break the curse, they had to marry persons of the Higetsu family who have strong spiritual power, and have to bear a child by the next red moon.

Now, the curse befalls to Rindo Naoto.

In order to break the curse, he has to beget a child with one of four sisters of the Higetsus.