Hifumi (genderfluid, they/he/she) x Kazuichi (trans girl, she/her), bc I saw people comparing them negatively and it's not fair! They're not rivals, they're friends/datefriends!
Kaz sees Hifumi and feels sorry for them, remembering herself when she looked nerdy. She has this idea of "Im gonna help him look cooler!" shows up to Hifumi (Hifumi is terrified at first) and says "Im Kazuichi Soda and Im gonna change your life!"
They go clothes shopping for "cooler" clothes for Hifumi. Hifumi misunderstands a bit and thinks theyre looking for stuff for cosplay. After finding and trying on a flashier outfit, Hifumi rejects it in favor of some Princess Piggles tshirts in the girl's section, and grabs Kazumi's arm to run over there. Kazumi thinks Hifumi is cute when she's talking about Princess Piggles (or maybe he was already cute to begin with? Ack!) Kazumi sees how unembarassed Hifumi is with girlier clothes, and after a lot of initial hesitation ends up gravitating towards the Piggy Princess dress, which Hifumi thinks is cute on Kaz.
They end up dating. Hifumi's presence ended up changing Kazumi's look instead of the other way around, though this is where Kazumi was going to go on her own eventually, she just needed some support. "Is this how you were gonna change my life?" Hifumi teases, kissing her. Kazumi blushes and admits "you changed my life" before giving her a kiss too.