Irisu Syndrome is a freeware game developed by a small developer group in Japan, a English patch about 1 year later the game was released.
The game consists to match up blocks with the same color making chains. As long you progress, a better story you might obtain. The game is classified as Puzzle and Challenging. And to many people, is considered as creepy.
The game have been making since 2006 (shows a hidden configuration file):
# 2006/02/19 by‚Ä‚Â
^Notice, buggy Japanese letters above
And many leftovers are present in the game, including, concept arts they used to make the game. Many of the game stories are based on the concept arts. There are 5 concept arts in total:
This seems to be a image previous than the first one. As it translated, it shows it’s not completed.
Edit: By the name of the file “irisukai_04.jpg”), it seems this file WOULD appear in the story mode (you can collect papers in metsu mode along you match good scores and chains). The other used files are “irisukai_01/02/03/05/06”.