The people in the Floating Sea Prison are bound to die. Everyone who comes in forgets why they died. They are very angry. And if you die here, the memory will remain.
However, there are some special ways of death that allow people, in addition to reincarnation, to retain their memories and occasionally appear in different places after death.
There is also a gate through which one can escape, but there are people stationed there all year round, making it difficult to escape.
Another way is to be summoned.
Since the two siblings can change their appearance and have nine tails, the elder sister suggested a way of death such as sacrificing the tail to see if they could escape. The younger brother was born with a looming ninth tail, so the older sister volunteered to be the scapegoat.
Fuhai Prison does not produce good people, except Juyu. This man was very kind to the siblings, but he still couldn't get out of Fuhai Prison. Whenever he looked out, the siblings would be curious about what he was thinking.
Intention: Decent people should do decent things