Tentacles of the Black Star

The Black Star has drowned the world. At least that's what's whispered among the faithful in the underwater shrines. Aphelion is no longer among the faithful. She wants to live her life, but the cult of the Black Star is trying to drag her back into the depths. Her body is changing and soon there will be nothing human left. Perihelion works for a company that creates human-fish hybrids. She has a choice – help her twin sister avoid becoming a mindless drone, or give her up to secure her own career advancement. Is sisterly love stronger than mysterious cosmic forces?