This is one of her biggest secrets, a long time ago she left her home, while her mother used to mistreat her and her father always chose his wife's side. Outside in the cold night she met the leader of the most dangerous streetgang in her neightbourhood. She went with him and came into the beyblading gang. He learned her how to beyblade and develop her talent.
Then she met Rini, a little girl who had lost the way because she had run away from a few boys chasing her. She helped her getting home and later they became really close friends.
Rini's parants thought that Reena was orphan and adopted her. Later she told them the truth, but she didn't needed to go back. So she stayed in Tokyo as their daughter.