(The first volume contains a lot of FATE elements. If you only want JoJo, skip straight to Volume Two from Chapter 45.)
Hello, I'm the heroine XX, a Galactic Police officer and a righteous Saber from the Aether Universe, here to hunt down criminals. I'm still 399 yen short of a filling meal to recharge my energy. If you lend me the money, once I've defeated the space criminal Baltan, I'll ask my superiors to award you a Galactic Medal for Bravery!
...?
Looking at the imposing blonde girl before him, Bubu and his all-purpose Sticky Fingers slowly typed out a question mark.
Many years later, Bubu, now the godfather of the Ye City mafia, recalled the first time he met Miss XX. He glanced around and, amid the unsurprised looks of Abbacchio and the others, let out a long sigh: The Galactic Police are a menace!
P.S.
This book is also known as "Stay Away from Me!", "I'm Really Not a Yanke Star", "Re: Starting a Yanke Gang from Zero", "Boss, Add a Little Cyberpunk", and "The Galactic Police Are a Menace"...
(I've already completed a million-character flop of a novel, so you can trust my integrity.)