As a note, this does *not* work on Ys V Expert. Only the standard version. The games are mechanically similar under the hood, but the data's been moved around enough that making it work with Expert would require applying each hack individually to Expert, starting from the ground up. This wouldn't be difficult, but it wouldn't be trivial either, and I'm frankly sick of starting at the game. Do you know that I was nervous about going to bed last night, fearing that someone was going to find some nasty game-breaking glitch in the patch despite how thoroughly we tested and that I wouldn't be able to fix it until the morning? This game crashes if you so much as look at it wrong.
If the game crashes after patching, you're either 1) patching Expert, don't do that, or 2) your ROM has a header, which can be removed using
http://www.romhacking.net/utilities/608/ this.
Edit: Oh! Fun fact: the font, by the way, is actually from the SNES release of Ys 3: Wanderers from Ys.