DISCLAIMER: I DO NOT OWN BEYBLADE OR ANY OF THE CHARACTERS. THIS IS JUST A FAN-MADE STORY!
When Kai fully recovered and left the hospital, he and Tsukino went back to enjoying a beautiful relationship together. They spent even more time with eachother, relishing eachother's company and thriving in the love they shared between them. Nothing and no one ever stepped in between them again, and nothing and no one could and would ever be able to separate them. At the age of 24, they married and spent their lives together, supporting eachother with the true love that held them together. They lived together in Kai's mansion, finally filling it with a happy soul that had been torn out when Kai's parents had been murdered.
And Boris and Mitsuhide were left to curse their sorry lives in prison, and after their death, well, we all know where their final destination was!
So that's it! I hope you enjoyed the story! I don't really have any ideas for a new story yet, but if I do I'll start writing right away!
Love ya! :)