Little Opposites (Pixiv Fanbox)

Just two girls staring at each other. They hate each other 😤 One of them likes to run at the park and do a lot of cardio. The other one likes to do a lot of "cardio" as well. Both of them developed a certain part of their bodies because of it. Can you guess who is who? 🤔 Not to mention, they hate each other because they are secretly jealous of the other.