Those are the character's on the story of this world... The world that once had more life an energy, were death wasn't a usual thing , were streets was always full of laughter and noises. Hum...What happen to this world, you ask? Well, nobody really knows the answer ... the only known thing is that there are monsters roaming around. And barely any living being walks on the street, of course there are exceptions.
In the middle of a city, bright despite the clouded an dark sky, and with a little of mist, there are two girls one of white hair an white clothes and the other with black hair and dark clothes.
The name of the black hair girl is Ari, she has 20 years old, and roam this world with the purpose to discover what caused this world to collapse, and created The Yearns, black monsters with hollow eyes, no mouth, long body that are curved. despite not having a mouth they are able to do noises, the people of before had registered that the sounds are like cries. Those monsters attack any living being that appears on front of them, however they don't eat the body of the human, and that is known they don't eat the soul neither.