Secrets of the Three Worlds

22 years ago, an everlasting war between demons and angels came to an end, bringing peace to the three domains. But, as it has always been throughout history, it wouldn't last forever. Shane lived his entire life as a normal boy until his father disappeared when he was 16. A year later, Shane and his younger sister, Mona, finally found a sense of normalcy. But it wouldn't last long, as Shane learns the truth about his family, he is left with a major burden. Shane discovers he is part angel and the last hope to stop the current demon king from restarting the war.  As Shane travels through the demon's domain, he learns more about his family and his role in the world.  As Shane learns the secrets of the 3 domains, his power will continue to grow. No matter how strong his power is, he will only use his power to ensure that his little sister remains safe from the dangerous world he is in.  But how long will Shane be able to keep the people he cares about out of the dangerous world he's a part of?