Dual nationality (Selection of Nationality)
Article 14 Nationality Law
(1) A Japanese citizen having a foreign nationality shall select one of the nationalities, where he/she obtains foreign and Japanese nationalities prior to his/her becoming twenty years old, before his/her reaching twenty-two years old, and where that time when he/she obtained foreign and Japanese nationalities comes after his or her reaching twenty years old, within two years from that time.
(2) In addition to renouncement of the foreign nationality, the selection of Japanese nationality may be accomplished through selecting Japanese nationality and declaring the renunciation of the foreign nationality (hereinafter referred to as "selection declaration") pursuant to the provisions of the Family Register Act.