Chapter II Cooperation with the International Criminal Court
Section 3 Surrender of an Offender Sought for Surrender, etc.
Subsection 1 Surrender of an Offender Sought for Surrender
(Postponement of an Order for the Surrender of an Offender Sought for Surrender)
Article 26 (1) In the case prescribed in paragraph (1) of the preceding Article (limited to where the offense underlying the surrender request constitutes a serious crime), when the Minister of Justice finds that the case falls under either of the following items and that it is unreasonable to immediately effect the surrender of an offender sought for surrender, he/she may postpone the order for surrender notwithstanding the provisions of said paragraph:
(i) when a case connected with a crime other than the offense underlying the surrender request, that has been committed by the offender sought for surrender is pending before a Japanese court; or
(ii) when the offender sought for surrender has been sentenced to punishment by a Japanese court with regard to a case prescribed in the preceding item, and he/she has neither served out the sentence nor come to no longer be subject to the execution thereof.
Postponement - admissibility challenge
EDIT.