Sega Games Co., Ltd., originally short for Service Games and officially styled as SEGA, is a Japanese multinational video game developer and publisher headquartered in Tokyo, Japan, with multiple offices around the world.
... I might own too many Fujishima-sensei & Sakura Wars books.. maybe
Well, this book covers ALL design aspects of the first game - characters in all their many outfits, pages of villains, KOUBU-mechas and locations. As both finished color works and b/w sketches.
And then it kicks it up a notch with a few pages of interviews, sheetmusic with lyrics so you too can sing along to the theme song AND a sewing pattern for making the Hanagumi battle uniform (xerox the pages, enlarge the set numbers & get the dictionary out for directions reading)