GIGA

[CIA]

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[Mr. X]

I'm sure there are subtitle apps the only problem is Giga has a proprietary format that can't be run in anything other than their player. So, unless they allow playing in other players or add this support to their player, you can't subtitle the movie.

[CIA]

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[ThatOnePervert]

They do subtitle some of their videos, but I wish they did it for all of them. It's porn, between regular plot beats and the usual sex dialogue it can't be that hard.

[Richtrickle]

There actually is a service that I’ve used, although it does get a bit expensive depending on movie length and release date.
Check out erojapanese.com

There’s a handful already translated on there. And they also seem open to crowdfunding, if you could find a forum or something of people with similar interests