Light is the source of life, and mysterious monsters and robots are after its three powers: Red, Green and Blue. Nobody notices the danger except three children. Ryu is a simple, mischievous boy who openly dreams of conquering the world. Guccho loves machines and food but scares easily. Becky is cute with a very twisted personality. Their friends include Rosso, Gibson and Bo, aliens who usually take the form of animals. Because these aliens differ in principles, goals and tastes, dealing with them teaches the kids why communication matters.