Might as well keep discussing world records here, even though the first post hasn't been updated in a while.
LoLK scoring has been progressing quickly since the full release-- the player who held the demo Sanae record, コレット (collett), has already reached a score of 2,137,184,450, and in Hard too. (Is 3 billion possible on Lunatic? Or even 4 billion? Graze-oriented systems tend to have quite a lot of room for improvement over time, as new or more efficient grazing methods are discovered.)
Meanwhile 美国妖精转转 (in-game name Reisen) has already broken the 2 billion mark on Normal (and reached 1.3b Easy). Looks like Reisen's the clear highest-scoring character with Easy's lower bullet density, but will Reisen win out over Sanae's bomb-grazing on Normal as well?
Not much in the way of polished Extra scoring yet-- the current highest score is a no-death Reisen run at 577m. I'd guess Reisen will easily keep the lead in Extra though, since at 40m per life Sanae's not gaining as much (potentially losing points) by bomb-grazing nonspells.
All replays can be found on
Royalflare's th15 page at the time I'm posting, though I'm not sure how long they'll remain (since they're being improved frequently, and since Royalflare's page hasn't yet been cleared for the full release).