Mad Chimera World

Mad Chimera World (マッドキメラワールド) is a manga series written and illustrated by Seishi Kishimoto. It is serialized in Morning Two.

Plot
In a world overrun by chimerical creatures where the females eat and kill the males, a pair of siblings explore the land. Usagi, the older sister, protects her brother Mitsuki, a curious chronicler who is able to read books and knows that the world was once different.