Hojo, asked a soldier to try an experiment, the doctor sweetened the ear of the aspirants saying that they could be as strong and powerful as Sephiroth, the greatest hero soldier first class, but in reality he wanted to test hybridization, gather a strong soldier with the savage force of a beast.
Upon leaving the capsule, Kai realizes that it was all a hoax, he was just a soldier's dog, just obeying the orders that his superiors give him.

now some history

Some night in 2005, dad comes home from work with a gift, I would say the best they ever made for me, the Final Fantasy VII DVD: Advent Children, I didn't know anything about this beautiful and vast universe, as a child I could never play FFVII Because my parents' economy was very low, the only thing I could do was review the gameplays of that time to know the history that caught me so much, some time later I started doing several small jobs and saving I was able to buy a PSP, and reviewing the catalog of games, I found the Crisis Core: Final Fantasy VII, it was the first game in this saga that I played, finished, enjoyed and even cried, in addition to VIII, XIII, XV and the remake of VII are my favorites, the rest they couldn't get my attention.