From all the threads I've read here's what I've gathered about this series
Blue haired girl is the dominatrix leader of an oppressive empire of sex slaves that's constantly expanding
Eventually they encroach on some farm boys village and tragedy ensues, causing him to create a ragtag group of rebels
One of these rebels who looks suspiciously like Aigis from Persona 3 ends up getting wrecked and has her head put on a spike
Farmboy takes it hard and goes full on Guts and brings the fight straight to the dominatrix but loses and becomes a martyr
Now apparently has resurrected as a dragon and the dominatrix had her hand cut off to be used as a sex toy by her most faithful servant apparently?
Also some girls had their purity beaten and fucked out of them by a dog