Add penemue and gabriel to the harem

Isseimorderd

oooh someting new and original how rare!
as for paring how about Issei X Lancer Arthuria or Musashi or Beast 2 herself Tiamat? thought Nobunaga or Kagetora would also be good since he is Japanese

New and different. I like it.
I wanna see more of it, keep going. Update soon.

I am a fan on demon archer nobunaga oda

Thank god, it's not a shiro wankfest like most other crossovers with the fate and dxd. Sure, shiro is cool and all but he has overstayed his welcome. Issei is way more relatable character and isn't a suicidal maniac(most of the time anyway). And kudos for not including rias or the other pointless canon girls since the only ones i can consider true waifus are Ingvild, Rossweisse and maybe Le Fay.

You have my interest in this story. You could go the Le Fay Pendragon route and possibly see her reaction knowing that Saber is King Arthur or Mordred in the Holy Grail War.

Not a bad start can't wait for the next Chapter.

And if your talking about Rare Pairings how about Issei X Lancer Arturia for shits and giggles

Issei X Mordred!