CERO: D (17+)

Full Name: Computer Entertainment Rating Organization
Country: Japan
Founded: July 2002

From Wikipedia

The Computer Entertainment Rating Organization (特定非営利活動法人コンピュータエンターテインメントレーティング機構, Tokutei Hieiri Katsudō Hōjin Konpyūta Entāteinmento Rētingu Kikō?) (CERO) is the organization that rates video games and Computer software in Japan with levels of rating that informs the customer of the nature of the product and for what age group it is suitable. It was established on July 2002 as a branch of Computer Entertainment Supplier's Association, and became an officially recognized non-profit organization on 2003.

Rating D (ages 17 and up) equivalent to ESRB's M rating, PEGI's 16 (high end) and 18 (low end) ratings, USK's 18 rating, and OFLC's MA15 (low end) rating. Games rated D include Higurashi no Naku Koro ni, Halo 3, Ninja Gaiden, Baldr Force EXE, BioShock, Bayonetta and Resistance 2. This is the strongest unrestricted CERO rating.