Story of DOA6 (Spoiler Alert!):
Five months after Gen Fu taught Eliot his secret skill, he died from old age. After living his life as a good human, God gave a chance for to revisit earth again, as half human. Gen Fu then came back from the sky with his immortal angelic wings. Feeling young and strong, his passion to fight was reinvigorated again. With this passion, he kidnapped Nyotengu to gain Hayabusa's attention, but he didn't give a fuck. His temper led him to waste her and proceed to kidnap all DOA girls instead. Wind blew strongly, carrying waves of old man's smell. The blowing wind carried message to the Wind Boy, Hayate, that Kasumi and Ayane are in danger. Without thinking twice, Hayate rushed to where the wind blows to take them back. Hayabusa realized Hayate's sudden mission, so he followed after he sent his falcon to tell Bass, J. Lee, and Zack to help rescuing their dear families and friends.
Few hours later, they came together to defeat the Angelic Gen Fu, but none of them could defeat him, as only Gen Fu can beat Gen Fu himself. Hayate talked to Hayabusa, suggested him a very bad idea with high risk, yet worth the try. Hayabusa nodded in approval. Hayate then left the scene immediately. Raidou, the skill thief, was resurrected as half cyborg a while ago, talked to Hayate about this problem. Raidou's villainy mind never dies, he agreed to help Hayate just to be able to learn Gen Fu's ultimate move and so there goes the big man met Gen Fu on the field for a fierce battle. The furious fight didn't take long for Raidou to learn Gen Fu's ultimate move and copy it. Gen Fu, who have waited for a worthy challenge, finally ready to kill his mighty opponent. Finally, 'The Old Man Passion' was blasted from his rock solid hand towards Raidou. At the same time, Raidou executed the very same move. Huge explosion happened - the light was so blinding, the tremor was earth shattering. There goes the life of two resurrected legends. They died again on the very same earth. Beyond the smoke, Hayate knew his sisters were saved. He quickly ran onto them. But alas, the double 'Old Man Passion' created radiation and impregnated DOA girls. Together, they gave birth to Rai Fu, the son of destruction. Rai Fu killed Hayate immediately. Hayabusa summoned his Fire Drago at him, yet Rai Fu ate it. Seeing this, the rest of the boys felt unnerved and ran.
Will they defeat Rai Fu in DOA7? Maybe. Maybe not.