Umeda Mika is a homeless orphan girl living in the slums of the Arakawa-ku district in Tokyo, Japan. Often referred to as "Loser Dog" Mika will do just about anything to ensure she has a decent meal; even if that means eating from the trash... or stealing from the yakuza. Mika's life changes in an instant when she gets kidnapped by the Bara-gumi, the Rose Group, and is forced to become the loyal servant of Ninagawa Charlotte, their ruthless leader with an iron fist and a strange desire for child soldiers. Through trials of torture and tragedy, how far will Mika go to save herself from the pain of suffering?