Laconic / Sakura Wars

The Game: Turn-Based Strategy + Dating Sim = A pretty cool game.

The Story: A Chivalrous Pervert and his harem do plays by day and use steam-powered Mini-Mecha to fight demons by night.
Unabridged version, go forth!

http://tvtropes.org/pmwiki/pmwiki.php/Laconic/SakuraWars