(Restrictions on extradition)
Article 2
(viii) When a criminal prosecution for an offense committed by the fugitive other than the requested offense is pending in a Japanese court, or when the fugitive has been sentenced to punishment in a Japanese court, with the requested offense but, has not completed serving the sentence or the sentence is still enforceable
4. If the person sought is being proceeded against or is serving a sentence in the requested State for a crime different from that for which surrender to the Court is sought, the requested State, after making its decision to grant the request, shall consult with the Court.