Trials of the Netherworld

She died...twice, but the goddess still won't let her go. She died in Earth, and then the trials, but she's back. Cleaning up the Goddess' mess so she doesn't have to forfeit her throne to her younger brother. All three realms focused on the middle sibling's stage. Earth. They are the law so both siblings try to appease them. Yet the goddess is losing control of the netherworld and no one knows why.