Tokimeikis CheckIn - CG-Patch
Just as the title suggests :)
If you like this game you might want to try:

Nocturnal Illusions - Censorsip patch
The translators cut out a few pictures from the english version of this game. If you have played the game you may have noticed that the screen went black as you began the scenes with Red-Hood and Arisa. This Patch will fix this by adding 11 new pics. I suggest that you forget about this and get the version below instead though, as it will fix some additional bugs too
If you like this game you might want to try: Nocturnal Illusions - PowerPack

Nocturnal Illusions - Censorsip patch 1.1
The same as the one above, but some problems are corrected. Arisas pictures displays in the remenisce, a graphical bug is fixes as well as a couple of bugs in the game itself - Most importantly the echobug wich made the game call the same sentences over and over again, one of the most annoying bugs ever, but wasnt corrected in the original version since this was a gamebug, not a patchbug
If you like this game you might want to try: Nocturnal Illusions - PowerPack

Mayclub - Censorship patch
Does the same as the patch above, just for a different game. Work discontinued, so just one scene made it..I didnt find anyone willing to translate the other one. If you want it get it now, I may remove it later due to rather heavy contents.
If you like this game you might want to try: MayClub - Toolbox

JASTPatch 1.0 - General bugfixer
This patch is designed to eliminate several problems found in Runaway City and Season of Sakura. The main bugfix is the 'sliding black' effect that made the game hang. Also fix some delaybugs, general dos settings and a few other problems. If you got any problems with these games you should try running this patch.Note: This patch is updated, better download the one below instead :)
If you like this game you might want to try: Season of sakura - Savegame editor

JASTPatch 1.1b - General bugfixer
Same as above, but fixes an additional bug in the hscene with Mio.
If you like this game you might want to try: Season of sakura - Savegame editor

Nocturnal Illusions - PowerPack
This application is a variety of tools for Nocturnal Illusions. It includes a Savegame editor with CG and levelskipping abilities as well as moe powerfull tools as Extractor for extracting resources, a decrypter for unpacking these and an encrypter if you want to include the edited parts back into the game. It can also make the game run in fullscreen as well as a couple of other effects
If you like this game you might want to try: Nocturnal Illusions - Censorship patch

MayClub Toolbox
Pretty much the same as the powerpack for nocturnal illusions, it does however got a more powerful savegame editor, and it can expand the Option menu to include 'view endings' for additional hscenes. It lacks the engeneering abilities though, but if you want to extract and decode resources from the game you can use the NI toolbox and tweak it a little
If you like this game you might want to try: MayClub - Censorship patch