Within the depths of Tokyo, lived four powerful and unique ghouls known as the Crystal Gems. People with gems on their person that grant them greater power. But one of their number falls to childbirth, bearing a half-ghoul hybrid. Now the remaining Gems, Pearl, Garnet and Amethyst, must try their best to raise her son in her stead. Whilst keeping out of the CCG's radar. Rated M.

Para llegar a ser un técnico de armas, tiene que pasar sus ciertas fases, pero las cosas no son fáciles; ¿Cómo llegar a tener amigos si solo te ven como un trofeo?; Sin embargo, una mirada azulina le cambia por completo de opinión.