Sky City on the Clouds

Yin, a wanderer living at the bottom of Sky City, fights with the inhumane wanderers at the bottom for food rations in order to keep his sick sister alive... During a fight for food, he met the Green Wolf from the Green Wolf Gang, and he joined the Green Wolf Gang and lived a normal life. However, the deterioration of his sister's condition and the sudden appearance of the "scavenger" from the top broke this hard-won peace... If you want to cure your sister's disease, you must go to the middle layer where the modified people live...