Magic Knight Rayearth was a 1994 RPG by Sega for the Sega Game Gear, released after the CLAMP's Magic Knight Rayearth manga.

This Sega Game Gear LIMITED EDITION handheld console is a great retrogaming item for collectors. Only sold in Japan, the handheld console has been produced at a mere 20,000 units. 

Retropixl has a few of them both brand new, mint and a D rating.