"Maki-Chan Graphic" images used in the game are the .MAG format, a well-known image format supported by several programs, including RECOIL. The file format details can also be found on this website.
0 wa Rei-chan no Rei
Genova
Lover's Kiss
Needle Garden Vol 2
Otona no Omochabako CG Shuu Vol. 2
The Bitmap Graphic of Glass Corpse
The Red
Tsuki no Hikari ni Madowasare 2