(Article 731) A minor shall obtain the consent of at least one parent to marry. Lineal relatives by blood, collateral relatives within the third degree of kinship by blood #2, may not marry, except between an adopted child and their collateral relatives by blood through adoption.

Is it legal to have two wives in Japan?

Polygamy is illegal in Japan. Shibuya reportedly married some of the women but later divorced them.

How many wives can u have in Japan?

The three of them live together without being married as polygamy is illegal in Japan. Together, they call themselves the Iyasaka family. The place where they live is called Sekai no Iyasaka mura, which means The Worlds Iyasaka Village.