I tried several times to import in LB Lumines and Lumines 2 for PPSSPP emuator, but even if LB, at the end of the process, says "2 Games imported", Lumines 2 doesn't appear in the game list. I tried to import both Lumines and Lumines 2: Lumines iso (named lfc-lumi.iso) is imported but LB detect it as "lumines 2" and named the media as "Lumines II" instead of "Lumines". And the Lumines II iso (named psy-lumi2.iso) isn't imported.
I would check if your is the same, if so right click the game and "expand selected game". You may have to rename it in the edit to remove the 2, then search it and grab media. Its in the database as Lumines: Puzzle Fusion.
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