Mad chimera world is set fictional world where the human race is extinct and the land is now ruled by mystical creatures known as chimera. These creatures have a very distinct feature in their species, the females chimera eat the male chimera. Due to their eating habits, the world is short of male chimera and is now infested with female chimera. Usagi, the main protagonist of our story has to protect her younger brother mutsuki from all the chimera that want to eat him.
Usagi and mitsuki roam the lands to find out the truth and to explore uncharted regions of the world. As they travel through the post apocalyptic world they uncover fascinating secret rooms filled with countless books of the past age. Matsuki is a very bright young boy who loves to read. Through this activity of his, he has managed to uncover a rather shocking truth of the land.
It was once very different, there was a time when there were no chimera at all. Usagi will go through everything and do all that she can to protect her younger brother. And mitsuki will do all that he can do to unravel the secrets hidden in the books found throughout the land. Will usagis efforts be enough and will mitsukis findings really uncover what happened all those years ago, find out in mad chimera world.