Mad Chimera World

The story takes place in a destroyed world inhabited by fantastical creatures, where the female beings consume their male counterparts. Two creatures, Usagi and Mitsuki, venture out to explore the land. Usagi, the older sister, acts as a guardian for her brother Mitsuki, who possesses a unique ability to decipher the books hidden in their secret sanctuary. Through these books, Mitsuki learns that the world was once vastly different.