Welcome to this space adventure of a very distant planet called Cristya, a planet inhabited by children only, these children belong to the race of the Gisians a race too long-lived but in which children of this race can not live because of a deadly disease that kills the lives of infants, The only possible solution for children infected by this disease is to be sent to the planet Cristya to survive, besides the crystals of this planet are the perfect treatment for this disease, it is also a completely habitable planet for them, but not for adults because the opposite is the case, the atmosphere of Cristya is unhealthy for adult