He was described to have taught IA and ONE all that they know. He is very knowledgeable about ARIA and is connected to everything on the planet. Chourou is described to be one of the oldest spirits on Planet ARIA and acts as a “grandfather” figure to IA and ONE. The second member revealed is a large elder tree named “Chourou” (“長老”, meaning elder) or 'Choro no ki”, (長老抜き,meaning the eldest tree.).She is described as being a very sweet cat that watches over IA & ONE. She acts as a mother and has been with IA & ONE all of their lives and came to Earth with ONE. A gray, multicolored cat named “チコー” (also known as “Neko-san” or simply as “cat”) is one of the spirits that exists on ARIA.
Four inhabitants of the planet were introduced and their relations to IA and ONE were revealed: Planet ARIA is described as a world similar to Earth with various life forms that resonate and co-exist together, several of whom raised IA & ONE. In a series of YouTube videos dubbed ARIA STATION, IA and ONE introduced their home-world known as Planet ARIA. ONE has little background, however she and IA were given some background information for the ARIA - IA Musical & Live Show – performances. ONE is the second installment in the '- ARIA ON THE PLANETES -' project.
