Girlfriend of Steel/Iron Maiden
- Girlfriend of Steel 2nd Official Visual Book (2005): Covers Girlfriend of Steel 2nd.
- Iron Maiden Story Book (1997): Covers the PC version of Girlfriend of Steel.
- Iron Maiden Visual Book (1998): A mook for Girlfriend of Steel.
- 2nd Impression Bible (1997): A game guide for the Sega Saturn Neon Genesis Evangelion 2nd Impression. E53
- The Outbreak of 3rd Impact (2007): Covers the pachinko game CR Neon Genesis Evangelion Saigo no Shisha.
- Sega Saturn Perfect Guide (1997): Covers both 1st Impression and 2nd Impression. E6
- Shinji Ikari Raising Project Visual Book (2004): A guidebook for the computer game Shinji Ikari Raising Project.
- Eva and Good Friends The Stripping Project! Complete Original Collection (2002): Has all the CG that appears in the game.