My Myth: "The creation of the good and the evil"

In the beginning of time, there was just a small isle in the middle of nowhere. A sacred place where only two families of godlike beings lived, the Joestars and the Brandos. Both families weren't related at all, the isle was splitted by a big cannon, full of rocky peaks and a really grimm atmosphere. One day, the Joestars decided to investigate, so the Father George Joestar, and the mother Erina ended up planning a trip to the other side of the isle. They left their son, Jonathan Joestar (commonly known as JoJo) alone on their home. When the two parents were crossing the peak, they encountered something weird and misterious, a stone mask. "probably made by the gods themselves" they said, so they carried it on their trip. When they were crossing a rather flimsy and weak path, Erina's feet slipped causing her to fall with George to the bottom of the pit. Erina did not survive, but George did. Stunned by the fall, George woke up and saw a misterious figure, it was Dario Brando, with his wife. They went to check the place after they heard a really loud sound. They found both Joestars laying on the floor with some heavy wounds. Buy Dario wasn't the kind of people that helped others, he caught interest when he saw some rather rare and precious stuff on their luggage, so he proceded to steal some stuff. When George woke up. he caught Dario stealing his stuff, but instead of accusing him of robbery, he thought he was a helping hand (probably because of the hit on his head) and proceded to be really grateful towards Dario, they became really close friends. After some time, JoJo was 12 year old, Dario Brando was really sick, when he died, he told George he could get his son Dio Brando, to live with the Joestars as an adoptive son. When he arrived he made JoJo's life miserable, causing him to be a sad boy. While the years passed their affection towards each other started growing. Dio became really interested on that stone mask and he began to investigate it. With some experimenting he found out that the mask "activated" when blood passed through it, some claw like things just appeared on the mask's back, he proceeded to put the mask activated and he magically became a vampire-like creature. While this was happening, JoJo was practicing a magic he discovered called "Hamon", he found out it used light as a main source of energy. When JoJo found out that Dio had turned into a vampire, they both started fighting, marking the big difference between the good and the bad in the world. As time goes on, it is said that this fight won't ever end, because it balances the good and the evil in the world.