i'd call it a gross over reaction, looking at the numbers-
GROUP 2012 2011
Revenue Y543.03 bln Y556.17 bln
Operating Profit (5.86) bln N/A
Pretax Profit 22.76 bln (66.03) bln
Net Profit 14.55 bln (48.35) bln
Per share
Earnings 113.75 (378.10)
Sentiment: Buy