Ryu Hayabusa and Hayate vs Nightmare and Tira
Hell hath no fury like a ninja bent on revenge.
Through a twist of fate, Nightmare and his servant Tira find themselves 500 years into the future. The Azure Knight and his Angel of Death carve a path of destruction throughout Japan.
Unfortunately, the Mugen Tenshin clan was given the raw deal.
Not only the clan's council was slaughtered, aside from a number of ninja and innocents from both sects, but Shiden, the previous clan leader and his wife, Ayame were killed by Tira.
Word reaches Hayate while he is competing in a Karate tournament in Okinawa. Ryu Hayabusa, Kasumi and Ayane are there acting as his personal cheering section.
Returning to the village post haste, Team Ninja is shocked and enraged at the sight that awaits them. Following the funeral, Hayate swears revenge and Ryu tags along. Leaving Kasumi and Ayane to help the surviving members, Ryu and Hayate track down the two villains.
The showdown takes place inside Gifu Castle. Ryu faces off against Nightmare while Hayate takes Tira. Ryu is armed with his Dragon Sword while Hayate has his gear from the DOA4 ending. But he would much rather strangle the life out of Tira with his bare hands.