Zack Anderson's Prologue

Zack was a teenager that is curious about his past . The thing is that he doesn't remember a single thing! He just remembers that he was living with his grandparents in the village . The question is how did he get to the orphanage in the city and what was the short flashback that is always playing in his mind
There are more things that you need to know about Zack's biological parents and their background and what are the odds. He didn't even know that he is involved in magic and non human being phenomenon