[Western Crossover] She Raids on Her Female Account and Supports Her Family on Her Male Account

A soul formed by the accidental merging of several people, with incomplete memories, is wandering when a mysterious System suddenly finds it.

"Come save the world, girl! Then you can get your memories back!" The other party's voice is dripping with salesmanship.

Soul: ...

The soul refuses.

System: "Girl!! The quest rewards are incredibly generous!! You'd be losing out big time if you don't do it!"

The soul stares at the icon that reads "Spend 30 Saint Quartz to summon" and falls silent.

What the hell, isn't this that godforsaken game, FGO?!

So the soul silently scrolls down...

"Exchange 30,000 Saint Quartz for Romani Archaman."

Soul: ...

Holy crap!

With only a few memories left but a crystal-clear recollection of FGO's story, the soul says, "Sure, no problem."

But because the soul is incomplete, its body can only take the form of the game's Fujimaru Ritsuka...

"Wait a second, I have both a male and a female account, okay?!"

But why would a Beast of Humanity care about that sort of thing? Boy or girl, the targets are getting torn apart with bare hands, no exceptions.

The Servants quietly slack off behind their Master, whose Strength is A.

All the superheroes know that a well-behaved boy named Fujimaru Rikka is a good kid who saves the world, and that he has a villainous older sister named Fujimaru Ritsuka.

All the supervillains know that a crazy girl named Fujimaru Ritsuka is a bad kid who throws the world into chaos, and that she has a heroic younger brother named Fujimaru Rikka.

When everyone finds out they're the same person: "?!?!"

Fujimaru Ritsuka (Rikka): "Hmph."

For the doctor, a Beast of Humanity will do anything.

(Please note: the protagonist's moral compass is a little questionable.)