This was done by 'ShihTzu'. I'm not sure if this is the whole intro.
This is Future Japan.
A single boy gazed out at the red sea, his heart aching.
"When, oh when, will the sea be blue again?"
So muttered the hero of this story, Ken Urashima, descendant of Taro Urashima.
As he walked the beach, he came upon a monster crab tormenting a turtle.
He swiftly used his inborn magical powers to defeat the crab and save the turtle.
The turtle Urashima saved began to speak to him.
"Thank you ever so much. I was searching for one such as you. Please get on my back."
Urashima climbed aboard the turtle, thinking, "I suppose he will take me to the palace of the Dragon King, just like my ancestor!"
However, the turtle proceeded to warp through time.
Urashima wound up in a world he'd never seen before.
The turtle set him down and began to speak once more.
"Urashima-san. Please save our Dragon Kingdom. The Beast Empire invaded from the sky one day, and they have captured many including our fair princess."
Urashima agreed to take on the turtle's request.
Wearing the battle suit "Brigandine" given him by the turtle, Urashima set out on a quest to save the princess.