^ Having been following the news of Japan's marriage equality, nope. Same-sex marriage in Japan, including Tokyo, is still illegal. There is the partnership system for same-sex couples which provides limited benefits.
What @juanelric linked though is Tokyo High Court's first decision about the constitutionality of same-sex marriage being illegal in Japan. That's 2nd of the six high court rulings. The last one will be the second Tokyo High Court ruling on November.
After that is the Supreme Court ruling which will be as early as next year. Best case scenario is that the court declares the ban unconstitutional, in which the Diet must legalize same-sex marriage.