Rance IV: The Legacy of the Sect

This game was translated into English on 09/03/2013 and the link to download can be found on the translator page.

Summary
After the events of Rance 3, Rance and Sill find themselves on a floating city.

Original game manual can be found here (japanese only):

http://blog.goo.ne.jp/gekigangar/e/ef381df366719693685a70b807c7a4c4