Below is a ADR List of 21 Japanese stocks.
This is a great place to start your research and do your due diligence!
Advantest (ATE)
Canon (CAJ)
Hitachi (HIT)
Honda (HMC)
Internet Initiative Japan (IIJI)
Konami (KNM)
Kubota (KUB)
Kyocera (KYO)
Makita (MKTAY)
Mitsubishi UFJ Financial (MTU)
Mistui (MITSY)
Mizuho Financial (MFG)
Nidec (NJ)
Mizuho Financial (NTT)
Nomura (NMR)
NTT DOCOMO (DCM)
Orix (IX)
Panasonic (PC)
Sony (SNE)
Toyota Motor (TM)
Wacoal (WACLY)