As long as both parties are in agreement, divorce in Japan can be accomplished with surprisingly ease. A Divorce by Agreement in Japan only requires both parties to sign or stamp their seal on a Registration of Divorce and submit it to the local government office. Approximately 90% of divorces in Japan are conducted this way.
Breach of a promise to marry can lead to an award of damages in Japan. Furthermore, similar to some types of commercial contracts, promises to marry do not have to be written down to be enforceable, as long as there is enough evidence to show the existence of the promise. In many cases for breach of a promise to marry, the promise can be proved through showing that the couple had a traditional engagement ceremony, notified family and friends or purchased rings before the promise was broken.
The family registration system is used in Japan to register Japanese citizens from birth until death. In this way, the family register acts as a birth certificate, death certificate, proof of marriage and proof of divorce. It also can be used to certify Japanese citizenship. The family register, as the name suggests, is based upon familial relationships and parents, children and spouses will all usually be listed in the same register under a shared last name.
Normally, a child born in wedlock, or within 200 days of the start of a marriage, or 300 days from the dissolution of a marriage, will be presumed to be the child of the husband. However, in the case of a child born outside of these circumstances the court may order a paternity test to determine the father of the child in order to assign responsibility for child support.