Ren has a thought

As Ren kept watching Makoto dance, he thought to all if his other female friends. There were the other female Phantom Thieves, sure, but also people like Kawakami, Hifumi, Tae Takemi, even Ohya and Makoto's older sister Sae...

But Ren had a thought. What would happen if he could swap someone's life. Like maybe turn the hot goth doctor Takemi into the Big Bang Burger heiress Haru, or make the exhausted teacher maid Kawakami into the energetic model Ann Takamaki? If he gave, say, Futaba a trigger and then managed to turn Futaba into Ann, would that trigger stick to her, or because she thinks she's Ann, would the trigger not work?

Ren wanted to test this thought.