Akashi, Hyōgo
As of 1 July 2021, 107 municipalities and three prefectures have established a "partnership oath system" (, ' ), also known as "partnership certification system" (, '), which provides same-sex couples with some limited benefits. The couple is issued a special certificate which may be useful in matters such as housing, hospital visitation rights and consenting to surgery for a partner. However, the system is not legally binding and there is no legal obligation on landlords or hospitals to honour the couples' rights even if presented with a certificate, though cities have encouraged companies, hospitals and landlords to recognize the certificate. The various benefits provided by the system are also very limited in comparison to those granted to married couples; same-sex couples cannot inherit the estate and property of a deceased partner or attend the funeral of a deceased partner for instance. Partners must meet certain requirements, including living in the municipality or prefecture, being older than 20 years of age, and not having a spouse or another partner. 3 municipalities have also established a "partnership family system" (, ""). This system also recognises the children of same-sex couples, and allows them to make medical decisions for a child, and to pick up their children at schools and kindergartens (whereas previously only the biological parent was allowed to pick up the child). The first to establish this system was Akashi, Hyōgo in January 2021 followed by Tokushima in February 2021 and Adachi, Tokyo in April 2021.