Luna has been cruising around the mostly deserted city playing Pokemon GO all day like a lonely weeb. Her Eurobeat playlist has been going on this entire time. And now she's on her way back to Harmonia's, having the time of her life.
She'd notice a very pink door just kinda sitting there in the middle of the street, not attached to anything! Just a door.
Luna screeches her SUV to a halt noticing the weird pink door. Luna knows that she should just ignore it, but she is fully equipped with her Marked Sword and knives and heads inside. "Bring it."
Luna appears in a dark alleyway. A tv-head stands before her, they're wearing your typical schoolgirl outfit from the animes and whatever. The face on their screen is bright pink. "Your phone! Gimme!"
"Nice cosplay. Also hell no." Luna does not give her the phone.
"Thanks also PLEASEEEEE ITS IMPORTANTTTTT" The TV head whines, her screen showing the sob emoji. "All you gotta do is just hold it out I promise I won't take it.”
Luna has her grip rather tightly on her phone, plus her earbuds are wired and connected to it. In any case, she does as the weird cosplayer says and holds it out. "Please do not take my phone."
She stares at the phone intently. The screen begins to glow pink.
"Um. Why is it pink?" Luna asks.
"Jus wait a second" The glow fades, and there's a new app on the home screen! It looks like a purple cat.
Luna looks at her phone and sees the purple cat icon. With a deep breath taken, she opens the app.
The app closes immediately, but a blinding purple glow appears around her! She feels something flow through her, something amazing, something... magical. The glow fades, and Luna feels... cold. Oh, wait! That's because she's not covered in fur anymore! She looks like she did before demon-ification, except... she's wearing new clothes. She gracefully spins around and floating a little bit, her arms and legs gaining some pastel purple ribbons. On her torso, a frilly purple and beige dress appears onto her with a yellow crescent moon on the sash. Her trusty sword, the usual Marked broadsword, gains an Amethyst in the hilt. Her tail has a pretty purple ribbon on it as well. After a few seconds, the aura fades; the light covering her body disappears. For Luna, it feels like it's gone on for around 30 seconds, but for everyone else, the transformation is almost instant.
"What the fuc-- wait WHAT? Did I just..." Luna looks around at the dress and the frills, the ribbons, everything... it's amazing. "Holy shit is this what I think it is??? Did I just turn into a Mahou shoujo?"
"You're fucking welcome," Says the TV head before slinking into the darkness.
The door is still behind Luna, she may return to earth whenever she pleases.
"Holy shit. That's amazing."
Luna goes back through the pink door, feeling a lot more powerful than she did previously.
When Luna returns, the door vanishes into thin air. "Huh. Wow. What?" Luna looks fuckin pretty in this dress. It's like her saber cosplay but a whole lot more frilly. It kind of reminds her of Madoka with a splash of Sailor Luna. In any case, this uniform is super comfy. She drives home still wearing it ready to surprise her friends with her new powerup.