Anime Crossover: Why Are My Anime Powers So Overpowered?

[System + Multiple Heroines + Overpowered + Some Characters Gender-Swapped]

A bungling System lost its Host and left them stranded for half a year, so it compensated them with a deluxe gift pack.

Transformed into the progenitor of the vampires, they rampage through worlds from anime and games, while making up for past regrets along the way.

Could these really be the worlds I've been longing for? And there are so many girls waiting for me to save them!!!

Worlds to come: Fate + Date A Live + High School DxD + One Piece + Naruto + ...