A fellow who went by the online handle of Kayama did translations of Sakura Taisen 1 thru 4. He didn’t do everything, but a very large amount.
http://www.gamefaqs.com/dreamcast/25893 … aisen/faqs
http://www.gamefaqs.com/dreamcast/43157 … sen-2/faqs
http://www.gamefaqs.com/dreamcast/57728 … sen-3/faqs
http://www.gamefaqs.com/dreamcast/56535 … sen-4/faqs
Having said that. I doubt there is profit in doing an official translation of PC versions to Sakura Taisen. It will likely get pirated for the most part. Red Company, SEGA, and and NIS are already burned on the chances for Sakura Taisen in the west, after the monumental failure of Sakura Taisen 5. Western Galge gamers are also self defeatist with these “message campaigns” (I know the irony I’m doing). Lord knows I have first hand knowledge of it.
I wish you luck on your efforts, but I don’t see it succeeding. Galge without sex is a niche in a niche market. It would probably be better to use those translations I linked, ask Kayama for permission, and do a fan patch or something. He did a massive amount of ground work, so it’s a great start. Unlike a title for PSP or NDS, for PC’s there isn’t a “gatekeeper” that requires permission to have it work on the host device.
Had Sakura Taisen 5 succeeded, you probably wouldn’t have needed to even do this… the other games would have been automatically ported by NIS. But as it stands, there is no worthwhile fanbase for the series… or at least, one that would actually pay real money to have it.
EDIT
As for a Sakura Taisen 6… there was a lot of rumor in Japan, had ST5 succeded in the West, the profits could have been used to produce it. Obviously that was a total failure. The theoretical ST6 might have taken place in the US, or if you followed a few plothooks in ST5 and the OVA, might have been a new unit based in Berlin. Ahhh… what could have been if only people bought it… what a wasted opportunity…
EDIT 2
On a positive note, looks like the Sakura Taisen 5 Live Stage has something lined up for August and September:
http://www.sakura-taisen.com/event/ny_live2012/
At least the Japanese fans support the franchise and won’t let it die. They generally disliked ST5, but they’re willing to buy in and keep the hope going.