Gachiakuta follows Rudo, a boy born in the slums of a floating city where criminals and trash are thrown into the abyss below. Falsely accused of murder, Rudo is cast into this hellish wasteland and forced to survive among monsters born from human waste. Armed with mysterious powers tied to objects others discard, he fights to uncover the truth and climb back for revenge. The story explores rage, injustice, and the value of what society throws away.