Alright, so I seem to be at a weird state in Kamihime where my progress has grown stagnant. The crutch of the issue: Holy Crystals of Light.

All SR and SSR Kamihime need these little buggers, and I can't seem to find any of them without having to go through the shop trade option, which takes an eternity to do.

The game tells me I can get 'em via. the daily special quest, but I'm not so sure, because while my teams aren't good enough to do the Ultimate levels yet, Expert usually gives me the upgraded Stars of Light, which don't help me at all because I have about five of them and not a single Kamihime I have needs one yet. Both Standard and Beginner give me jack squat - just some elemental teeth.

Anyone here know the most reliable way of farming Holy Crystals of Light?