Website: vocadb.net
Usage: Search by album
Download the latest version here(github)
Changelog:
2015-09-01 v1.02
- Changed default language to romaji
- Removed LANGUAGE field
- Changed nameMatchMode to Auto
- Replaced Country with Track count in index
2015-08-31 v1.00
Thanks for making this, just got a request, any chance of setting up the script to show Romanized rather than Japanese?
Done and done, an updated version can be downloaded from the github link.
Just downloaded it but version 1.0 is in the zip file 
Can you try this link?
It's coming up as this:
# ###################################################################
# Mp3tag Tag Source for VocaDB
#
# Search by ALBUM
#
# This file should be stored in your tag sources sources directory
# %APPDATA%\Mp3tag\data\sources
# and requires Mp3tag v2.64 or above.
# [2015-08-31] v1.00
#
# ###################################################################
How to make it back to Japanese?
EDIT: Ahh whatever, just look in Revisions, edit it, close Mp3tag, launch Mp3tag again and try again. (Just remove &lang=Romaji)
OK, thanks 
Hey y'all, realize this is old as heck but I went ahead and put up an updated fork here with the new HTTPS urls to make the lives of future googlers easier. Enjoy!
[2022-01-19] v1.20
The old VocaDB.src is renamed to VocaDB#&Romaji Tags.src.
Added VocaDB#Original &Tags.src. This source will tag all fields with the default (usually Japanese) names. Also shows the original album name when searching for an album.
Added tags:
UNSYNCEDLYRICS: tags Lyrics in Romaji (Romaji Tags.src) or in the original language (Original Tags.src) of the song to each track.
VOCADB_TRACK_ID: tags vocadb track id to each track.
Download from the new github repository.
I know this is old, but I'm using the latest version of MP3Tag, let it through my firewall, and it still gives me a "404 - cannot connect to server" when trying to search from album ID. I can't find anything on the internet about how to fix this, so is it just because the code is old?
because of this i can't edit any of my singles : (
You were trying to search for a Song ID using the Album ID mp3tag source.
I just added some new Song ID query sources that let you search for songs one by one. Use those and it should work.