The Ryukotsu System (リュウコツ座系 Ryūkotsu-Za-Kei, Keel System) is a star system whose Kyutama is one of three needed to complete the Argo. Space.15: Savior of the Water Planet Vela The Kyutama was located on the planet Keel, where the forest spirit Eris was entrusted to protect it by Orion. Space.19: The Elf of Forest Planet Keel