hey i know you where almost raped but im going to black mail you for no real reason, ok?
That's the thing that bugs me the most: NO REAL REASON.
Those thugs were going to slaughter poor Gin, that's clear as day. At first, when they thought he was a girl, they were going to rape him; but after realizing he was a guy in drag, they were totally and absolutely going to beat him to a pulp. Y'know, to vent their anger.
But Asa rescued Gin. She chased away the thugs, all by herself. She was really cool and courageous. And then she took him to a nice bar, offered him a drink, befriended him, gave him tips about crossdressing...
Gin simply can't refuse her ANYTHING at that point of things.
But then, without any warning, Asa turns baddie and starts threatening him and blackmailing him. WHY?? Why the hell??? Gin would have said yes, out of gratitude, to whatever favor she asked of him. He'd have done it, no matter how crazy. This development makes no sense at all. It's like the author, halfway through her story, suddenly decided to turn Asa into a heel just because. Srsly, it sucks.