Disclaimer: I don't own Naruto or Kingdom Hearts
Ansem, the Seeker of Darkness laid on the floor in front of Sora and Riku. The Heartless knew how weakened he was but would not let this day be his last. He raised his hand and was about to open the Doors to Darkness so Kingdom Hearts could give it's darkness to him but then decided to open a corridor of darkness to a random world.
"This … it hardly … the end… Your darkness-I gave it …. All to you … My dark shadow still lingers and someday… I will return." Ansem said as he fell into the portal and disappeared.
"No!" Sora cried out as he jumped at the portal but fell to the ground.
"It's okay Sora because when he returns, we'll be ready." Riku said helping his friend up. Sora nodded, both boys not knowing that it would be a very, very long time before they saw the Seeker of Darkness again.
-Outside of Konoha-
The great chakra demon Kyuubi no Kitsune was currently battling the legendary Yellow Flash who stood atop the boss of toad summons, Gambunta. The gigantic from sent several liquid bullets at the demon who dodged them then shot a chakra blast from it's mouth. The fox jumped at the boss summon and slashed his eye, leaving a big scar.
Ansem fell out of the portal and landed on the back of the Kyuubi.
"Where am I?" He muttered standing up. He saw that he was standing on a large fox with nine tails that was battling a giant frog.
'A strange world I am in.' He thought as he struggled to stay atop the beast in his weak state. Ansem watched as a large ghostly figure with purple skin appeared in front of the Kitsune as reached it's hand out, grabbing the soul of Kyuubi and Ansem.
"What's happening?" The master of heartless asked out loud as felt his soul leaving his body.
The two great beings were put into the body of a newborn baby and the soul of Minato Namikaze was eaten by the Shinigami who then disappeared. The shinobi of Konohagakure cheered once the demon vanished and began returning to their home, not knowing that they had lost their great fourth Hokage.