How to install:
Mount Little_ro.iso with Daemon-Tools.
Copy all the files inside the X:\りとるろわいやる into your hard disk manually, let's say C:\りとるろわいやる
(X is your virtual drive where the game is mounted)

Official Web Site:
http://www.h4.dion.ne.jp/~furamen/syoukai14.htm

Demo Movie:
http://www.youtube.com/watch?v=Qbct1d2YntQ