Leaving Harry alone is a BAD idea, so Sirius convinces Remus and his cousin Tonks to take him somewhere "safe": no Death Eater would look for him in Vegas. Olga Marie needed some R&R from Chaldea, so was tricked to visit the city. The two wake up married, plus Tonks. Drinks and Elvis may have been involved. ("Fun" fact: not able to set the FGO chars, not available to. Sorry)

And the angels are all in heaven, but few of the fools are dead. While reading the Forbidden Scroll, Naruto reads an extra entry and unlocks a power considered lost. Is it a coincidence, or does the awakening of a Persona user forewarns a disaster once more?