This article is about a/an planet in Choushinsei Flashman.

Green Star is a planet within the Flash System. It is in the far-left of the five Flash planet and a neighbor of the Yellow Star.

It is known as the "green planet wrapped in rocky mountains". Dai was raised on this world after being rescued by the Flash, gaining a miraculous strength from living in the rugged landscape.

Some time before the Flashmen return to Earth, a prism from Green Star landed on the planet, where it ended up in the hands of a girl named Sumire Okano. Although Sumire died eight years before the Flashman return, the prism had altered her allowing for her to gain powers after her death, including psychic abilities and the ability to connect with others who have a connection with this planet, such as Dai.Ep. 37: A Ghost's First Love