>>6743150Kotobukiya had a line of original mech model kits called Frame Arms, where the gimmick was a standard frame and armor parts that slotted in, with potential for customs and interchangeable parts, no real source material and I don't think they ever made any manga/anime.
They got it into their heads to make a personified anime girl based on the Frame Arms Gourai, under the line Frame Arms Girl, shit printed money, the rest is history, its eclipsed the original Frame Arms and gone on to have anime and manga adaptations and led the way to Koto's other mecha musume model kit line, Megami Device