Lailah to Shinitagari no Kemono

In a city stricken by corruption, money and power govern everything. Life is especially difficult for chimeras, half-humans, half-animals. Despised by all, they form the lowest social class. Aron is one of them. Even worse, he's been raised like a beast by the mafia in one and only goal : killing. Isolated and maltreated, he kept the mental age of a child. His only hideaway is a picture book in which a little girl with blue eyes brings the hero of the story to heaven. Aron dreams of only one thing : to find this angel in order to be freed from his life of suffering.

So when, in the middle of a mission, he comes across Leila, a young girl with the same eyes as the girl in the book, it's a revelation : It's her that'll free him ! For the first time in his life, he disobeys his master and runs away with her ! Now the mafia is after him in a world he doesn't know the first thing about with a girl who hates him more than anything.

(Source : Nautiljon, translated)