Name this hentai

Ok so there are at least two episodes. The beginning of the first episode shows a young boy trying to find a girl but he instead gets decapitated and becomes a slave to a demon. The demon that owns him kills him over and over when he dies he just come right back alive. He eventually finds the girl he's been looking for with the help of his owner and two other females I think. The second episode the young boy has sex with his master while she sleeps but she never wakes up during the sex. Another thing I remember is the demons have an enemy female demon who lured them into a trap and they caught the young boys owner and raped her. That's all I can remember.