Information in the game database is updated periodically. Below, you'll find that information compiled as pertains to West One. The company may be involved as a publisher, developer or both.
Revenge of Drancon 
Kekkon: Marriage [October 10, 1996]
Mirano no Arbeit Collection [July 1, 1999]
Sotsugyou III: Wedding Bell [April 2, 1998]
Sotsugyou M: Male Graduation - Seitokai Naga no Kareinaru Inbou [July 30, 1998]
Soukou Kihei Votoms Gaiden: Ao no Kishi Berserga Monogatari [October 30, 1997]
Wolkenkratzer: Shinpan no Tou [March 1, 1996]
Relaxuma: Ojama Shitemasu 2 Shuukan [September 1, 2005]
Secret of Evangelion [December 21, 2006]
Shinseiki Evangelion: Ayanami Ikusei Keikaku with Asuka Hokan Keikaku [December 11, 2003]
There are numerous companies in the industry, and their names change like the weather. The information above is not particular about the finer details. Acquisitions are common, so companies with no recent listings may still be developing games under a new name. For example, DMA Design currently has a Rockstar name. Do you know of a title that is not listed above but should be? Be sure and let a staff member know. You can contact staff if you click here.