Why Is Kartia Forgotten?
Start with the arithmetic. Kartia sold 117,594 copies in Japan, a respectable figure, and 60,000 in the United States. Its competition in its own genre, in its own launch window, included Final Fantasy Tactics and Tactics Ogre, the second of which was published in America by Atlus itself. Kartia was the third name a strategy fan reached for in 1998, and third names do not become franchises.
Then consider the shape of its afterlife. There was no Kartia 2 to keep the world warm, no spin-off, no anime. Its single re-release, a 2011 Japanese PlayStation Network edition, never left Japan. And Atlus's own fame reorganized itself around Megami Tensei and Persona, leaving a standalone strategy game from the R&D1 studio's one experiment outside that line with no shelf to sit on in the company's own story.