This study examined the possibilities and limitations of a contract for same-sex couples. In the background of this research, the conclusion of "agreement" has been defined as one of the conditions for issuing the Shibuya district partnership certificate.
This study has made it possible to clarify the following ; What is the feature of “joint life contract” compared to French or Japanese related contracts such as French pacs (civil solidarity contract), marital property contract ; What kind of effect is considered to occur for third parties ; What kind of clause includes the possibility of invalidity.