Well, I tried modifying the font by deleting the letter "E" in caps in all fonts viewable, but for some reason when I booted the game, the letter E was still showing up. :/
I'm hitting a wall here that I can't wreck. xD
That's probably because the (2?) uncompressed fonts you modified were not
what you're looking for.
Which makes sense, sort of, since they're 8x16 and the in-game font is 16x16.
Relative search with the in-game JP kana order didn't give away anything so I guess even the text is compressed in this game.
Well, the story text isn't directly visible for me, but at least the tutorial text is uncompressed.
This bit of text in particular is at 0x038BDD.
Table file looks something like あ=00, ア=50, 1=A0, A=AA.
Some notable control codes:
F9FF=<end of text box with button press wait>
BTW, I find the existing English font to be ugly, so it might need to be changed (shouldn't be too hard though)