Board Thread:Event Discussion/@comment-12247050-20130725045730/@comment-174.5.129.65-20130726002814

2-2-1 means Story mode - Chapter 2, Number 2, First "1" at the bottom. :)

2-2-1 is a stage in the story mode where Hare of Inaba sealstones are not available, hence allowing you to obtain other feeder demons per investigation.