How to install:
Simply put the patch.xp3 in the game directory (The same place where you see 丸呑み.exe). Probably requires Japanese locale or language support to run properly like 99% of other Japanese games.

Special thanks to Sylphtastic for re-doing and vastly improving the buttons and Dargoth for help with getting word-wrap to work! Make sure to play through the Prologue first if you want an explanation of the battle system in the game. I’ll try to fix any bugs as they come up, just post them in the comments section.

Source:
http://roguetranslations.wordpress.com/2013/01/18/marunomi-english-patch/