Review Detail of BlackDragneel in DXD: King of fairies

Very Disappointing start. I don't see this story going anywhere I like. Mc is literally a slave and it is even insinuated that he was plotted against by rias to be one. I guess the MC just replaced issei in the story and it will continue as cannon with minor differences. Very Interesting idea but a very disappointing and frankly annoying execution.