Nihon Soft Hanbai
Nihon Soft Hanbai (日本ソフト販売株式会社) was a publisher and developer of PC Engine games (and accessories like the Battle Pad and Battle Tap) established in May 1980.   It was previously called Big Club (株式会社ビッグ・クラブ).  Before getting into the software business, Big Club operated a chain of Famicom repair shops.   The company is said to have gone bankrupt (perhaps in 1995, if this is in fact a bankruptcy notice referring to the same Nihon Soft Hanbai [appears to have the same address]).
Research Methods: Actual mentions, shared staff
- Armed F (JP Publisher: Pack-In-Video)
- Originally supposed to be published by Big Club.  Later supposed to be published by Nihon Soft Hanbai.   Retail release has "Big Don" in the copyright notice.
- Blade Land (unreleased) (Nihon Soft Hanbai) 
- Bouken Danshaku Don: The Lost Sunheart (JP Publisher: I'Max)
- Takane Ohkubo said in an interview that he worked on this game at Big Club.  He left Big Club to join Live Planning, likely in 1989, which would mean the game was developed long before it was released (1992). The name Manjyudo appears on the retail release, which was a company run by Eiko Iida , the producer on Jinmu Denshou and Armed F. Manjyudo may have just been a related company that somehow got the rights to the game.
- Jinmu Denshou (JP Publisher: Big Club)
- Planning, Some Music: Wolf Team; Some Music: Goblin Sound
- Rock-On (JP Publisher: Big Club)