I’ve compiled the chapters into volumes and added covers. Scanlation by Nameless. Enjoy.

Set in a ruined world overrun with chimerical creatures where the female creatures eat the males. Two creatures explore the land: Usagi, the elder sister, protects her brother Mitsuki, a curious chronicler who is able to read the books in their secret hiding place to know that the world was once different.

https://www.mangaupdates.com/series.html?id=140266