I want to do a Feudal Era Samurai rp, but not historic. More like an anime : demons, powers, sake, the whole nine yards. lol

I am still working on streamlining a plot but what I have so far is two warlords fighting over land. One of the warlords makes a deal with a demon lord for help. Demons begin attacking. Out of desperation, one town sends out  a call for samurai to help them defend against the demons.
Any ideas / twists to add would be greatly appreciated.