One Piece Vs. Naruto

After traveling through the Naruto world for ten years, Kageyama Gen has always kept a low profile and only been an inconspicuous medical ninja. No one knew that there was a countdown floating in the depths of his field of vision. Until the day of zero—— [World fusion starts. The sky cracked. The Red Earth Continent collided with the Ninja Continent, and the Grand Route and the Ninja World completely intersected. Chakra tears apart the old order, and Haki breaks the boundaries of power; Ninjutsu spreads across the sea, and devil fruits come to the ninja world; The old throne is crumbling, and new ambitions are sweeping across the world like a tidal wave. Uchiha Madara returns, casting a shadow over the ninja world; The world government blocks the sea and clings to authority that has existed for thousands of years; The new emperor rises above the violent waves, and the underground world quietly boils in blood and fire. And it all starts with the countdown to zero. Kageyama Gen originally just wanted to live. But when the two worlds truly become one This time, who is the hunter and who is the prey?