My friend is a magic girl is pretty funny.
https://exhentai.org/g/1113640/ecf0ce14bb/
Synopsis: A few years ago evil aliens led by the demon lord invaded and then magical girls appeared to fight them with power given by aliens. A certain middle school girl has a lifelong dream of becoming a magic girl and her brother and her guy friend both tease her for it, the later saying, "If you were to be a magical girl no one would want to look at you!"

and when a monster attacks the city she knows a magical girl will show up to fight it, and she asks her guy friend to come with her so she can finally see a magical girl in person and so they can take photos.

Her friend tries to talk her out of it saying we should go because it's dangerous, but she insists that it's her dream to meet a magical girl no matter what. And I want to meet the person I love! He is moved and says, "Rika, hold my shoes for a moment." Then to her bewilderment he screams, "Miracle Shine Star Change!"

He transforms into a magical girl who still talks like a punk. He tells her to stay back becaude she's about to see a real magical hirl battle. She says she wants to return what he said to her earlier (meaning she doesn't want to look at him as a magical girl.). And he covers his panties and tells her, "Then don't look!"

Then he beats the monster with a punch and then talks to his stunned friend.

He explains how it happened: one day he was walking home when aliens abducted him and offered him a wish, Kyubei style, as long as he fought for them. He says He just longs to go home, but the alien says the dream needs to have more power.

He says with a blush, "Hypothetically, maybe to attract the attention of the girl I love?"

The aliens says, "Good enough/You're eligible" and then he turns into a magical girl. (Of course he keeps this part a secret from Riku, which implies she is the one he loves.)