PART I. GENERAL PROVISIONS
Chapter I. Scope of Application
Article 4-2. (Crimes Committed outside Japan Governed by a Treaty)
In addition to the provisions of Article 2 through the preceding Article, this Code shall also apply to anyone who commits outside the territory of Japan those crimes proscribed under Part II which are governed by a treaty even if committed outside the territory of Japan.
Jurisdiction
Universal jurisdiction
EDIT.