[Western Crossover] I Crashed and Burned While Using Genderbent Heroic Spirits as Secret Identities

*Full title: I Crashed and Burned While Using Gender-Swapped Heroic Spirits as Secret Identities, and It's Definitely Because Every Identity Was Flirting with the Same Person*

[Blurb]

In 2020, the System chose me to save the world.

It equipped me with seven gacha mobile games from my real-world phone as cheats.

The System was easy to get along with.

It generously told me, "As long as you successfully save the world, you can do whatever you want."

So I made an unreasonable demand: "I want to try being a magical girl... I mean, a magical boy!"

System: All right.

And so it loaded the transformation module for Magical Girl Illya.

I regretted it so much I could have kicked myself.

Who the hell wants to see male versions of Drake and the White Gunner with no boobs?!

Even if they're my own secret identities, that's still a no!

And then...

"All that aside... what's that guy doing here?"

I pointed at the familiar yet unfamiliar man standing outside my apartment and asked in disbelief, my eye twitching.

"Saving the world is a great achievement that's hard to accomplish alone. You need a partner. That's a staple of anime, isn't it? Even magical boys get one," the System replied. "To keep the Host from feeling lonely, we specially matched you with the justice-minded companion you're most familiar with. Thoughtful, right?"

Thoughtful my ass! Do AIs and humans have such wildly different definitions of thoughtful?

I looked at the red-haired young man in the black coat, his expression cool and indifferent, and my vision went dark.

Why did you bring over my childhood friend, the one I cut ties with years ago and used to have a crush on?!

How am I supposed to focus on saving the world now?

[Before You Dive In]

1. Magical boy xxx, transforming into female Heroic Spirits in real time.

2. The characters' secret identities aren't all from FGO; there are characters from other works, too.

3. Original male protagonist, paired with Emiya Shirou. The partner of justice x a hammy world-saver. Stay firmly on the childhood-friends-to-lovers ship!

4. Includes lots of Moon Cell lore, mostly from the original FSN game and parts of FHA. Shirou isn't from one of the game's three routes, nor is he Red Archer, but he has indeed already been through a Fifth Grail War much like one of the routes.

5. The main setting combines DC and Marvel, with a few other British and American TV shows. Any references will be noted in the author's comments.

Theme: A secret identity master pulls off all kinds of outrageous stunts