Happy birthday, Gojo-sensei, UwU!
It all started with that unfinished manga. Unable to accept its ending, Meili decided to fish a lucky person out of a multiverse and use them as a pawn to change the story's conclusion.
The amusing thing was that she fished up an unrecorded Holy Grail. But when her magic awakened it, it seemed to trigger a fusion between the White Beast and the Grail, and that's how you came into being.
You arrive in a new world with no identity and no money. The awful Meili says she's letting you go and does just that. Luckily, you meet the kind Riko Amanai, who gives you food and clothes. So protecting her from an unknown attack in return is only fair, right?
You can't just live off her, so you take a flyer from the Star Religious Group. In the meantime, you use low-frequency magic to disguise yourself as a defensive barrier technique, making the rounds among the Three Great Families and working for their higher-ups while keeping everyone fooled.
Then you encounter your nemesis and take them down in one move. Seeing everyone's shocked expressions, you finally feel satisfied: your prank was a great success.
During my recovery, you may find: a low word count and poor writing, voice actor jokes, Phantom Night, and FGO characters popping in and out.
Theme: But when it comes to loving you, I never will.