So, I'm conflicted, because Japan is an anomaly in Asia. They are fairly cool with homosexuality.
In fact, the large majority are fairly fine with considering gay couple as normal and that they should have the same rights as heterosexual couples.
But that's not the case yet. In short, there's no legal gay marriage in Japan, you can't adopt or have kids at all if you are in a gay relationship (in-vitro, surrogate mothers and adoptions aren't allowed for gay or single parents)... BUT! There's been a recent case of the first gay couple being accepted as foster parents recently, so they are moving in the right direction, and fast!
Your marriage won't be recognised officially, even if you do it in a country where it actually is legal, and if, as a non national, you're in a same sex marriage with a Japanese, you don't have the right to reside in Japan (but then again, they seem fairly lenient to give "special visas" to bypass this rule).
Apparently, gay couples can't marry because of a technicality... marriage in the Japanese constitution is defined as "Marriage shall be based only on the mutual consent of both sexes and it shall be maintained through mutual cooperation with the equal rights of husband and wife as a basis.", and most of the Japanese people actually are for changing this...
The discrimination of gay and trans people isn't against the national law, tho a lot of cities have "unofficial" laws to prevent it. Some cities like Tokyo, Osaka and Sapporo have them, but they aren't really "officially binding". After seeing some parodies of gay men on some Japanese media, I thought they were more bigoted, but apparently, it's seen as satire, and with no real ill intent.
There is actually no law prohibiting being gay or trans, like at all, there's just no law either to protect them. By the way, Japan as clearly the least offensive History when it comes to this type of discrimination, and that's out of every country in the World, west included. They actually have a law since 2002 that gives the right to anyone who went through post-sex reassignment surgery to legally change sex.
So, in short, I'm conflicted... because the laws aren't really perfect, they aren't against LGBT rights, but they don't protect them either. And the people are actually really supportive of the cause.
And because on some point, Japan is a lot slower than some western Countries, but on others, It's strangely advanced.