Obviously it's too late to reply to this, but perhaps others might end up here looking for solutions occasionally.
On the matter of the ultra-speed, I am able to play the game normally by using Cheat Engine:http://www.cheatengine.org/downloads.php
Switch to Cheat engine, and open the running Utawarerumono process
Then enable Speedhack, and set to 1x and hit apply.
TADA! Should run at the expected speed.