The Golden Dragon Empress [High School DxD]

17 year old Sukehiro Natsuki was trying her best to fight against the life of poverty and isolation that she was born into. Now given the chance to go to Kuoh Academy, Natsuki finds herself thrown into a world she never knew existed as she tries to find her place in it and discover who she really is.

OC is Intersex, Issei/Harem, No Harem for OC, but they're in a polyamorous relationship