Shiki and his companions go to the planet Guilst, to hide from all the robbers of the universe, to rescue Rebecca. They must then face Rogue Out, the band of mercenaries who kidnapped him. To their surprise, their leader turns out to be "Sister" , one of the four brilliant Stars of the Great Demon they are looking for! But the situation is suddenly complicated: the Croque-mitemps, a space-time devourer monster dangerously approaching Guilst... Will our heroes survive this imminent cataclysm?! And what secret does Sister hold?!