Fury of the beast (Naruto fanfic)

Khezu and Shinzo Mikehisa were orphans. They knew nothing about their parents, only that they immigrated from Japan and left them at an orphanage. Their adopted mother was also a widow, having to work two jobs just to keep the family going. Never seeing their mom and not having many friends was a hard life, but when they're walking home from school and faint, ending up in some weird world the day Khezu's brother was shown a new book. Well, if that's not strange I don't know what is. They start going through a mysterious string of events and think that some evil is at work.