In this Jan. 28, 2019, photo, Kenji Aiba, left, speaks as his partner Ken Kozumi listens during an interview with The Associated Press in Tokyo. Kozumi and Aiba have held onto a marriage certificate they signed at their wedding party in 2013, anticipating that Japan would emulate other advanced nations and legalize same-sex unions. That day has yet to come, and legally they are just friends even though they've lived as a married couple for more than five years. On Thursday, Feb. 14, 2019, Valentine’s Day, the couple is joining a dozen other same-sex couples in Japan’s first lawsuits challenging the constitutionality of the country’s rejection of same-sex marriage. (AP Photo/Toru Takahashi)
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