Toushin Toshi II is a dungeon crawling RPG by Alicesoft. It is considered one of the classics of the Eroge RPG genre and despite showing its age, still holds pretty high scores on review sites.
The game was made legally free by Alicesoft and is now completely fantranslated. You can get it here:
As usual, read the readme and enjoy.
EDIT (11/6/2013): A new version has been released with some typo/bug fixes and several name changes due to the announced remake in order to fit the official names.