Copy the MGW_CathedralEdition folder over your installed game, replacing files. Its two subfolders match the game's own. This overwrites originals — back them up, or plan to reinstall to undo.

d2d1.dll

Hooks the game's text drawing so English isn't set l i k e t h i s, one letter per full-width cell. Delete it to disable.

init2\printmessage.fxf

Message-box geometry tuned for English.

spt\

The translated scripts plus namecol.xtx — replace them together or speaker names vanish.

optional exe

One byte changed (0x1A8EB, 74→EB) so a voice line keeps playing when you open the backlog.

Menus, buttons and the gallery are image assets and stay Japanese; so do the credits.

1. Install from the disc as normal.
2. From the power-up kit, copy the contents of 03: another record パワーアップキット\patch\ into the game folder — everything except MGW_ar.exe, and don't run the kit's patch.exe. The kit's exe is wrapped in Soft Denchi copy protection and won't start without that runtime; the voice data works fine with the older exe.
3. Extract this zip over the game folder, overwriting. It replaces the scripts and puts back the older, voice-patched exe.

Back up MGW_ar.exe, init2\printmessage.fxf and spt\ first if you want a way back. The full-voice update itself makes existing saves unusable — that's the publisher's change, not the patch's.