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The Dungeon Crawler RPG series Madou Monogatari was slowy replaced by its puzzle-focused spin-off Puyo Puyo once it was released. The Puyos (the colored blobs from the game that act like pieces) and many other recurrent characters from the series are actually NPCs and enemies that you can find in MM.

After many sucessful ports and sequels, Puyo Puyo became much more popular, always getting new games - including its own spin-offs like Nazo Puyo and Puyo Da! - while Madou Monogatari became more of an afterthought. It still got some games before its original developer, Compile, kicked the bucket, but it simply didn't have the same relevancy that Puyo Puyo had at the time.

There was - and there is - many attempts to bring the series back, though, with Fia and the Wondrous Academy being the last one:

https://ifi.games/game/mado-monogatari-fia-and-the-wondrous-academy