** Found: Peppermint **

Hey! I've read this manga years ago and I've been searching for it ever since with no success.I really hope someone can help me!
So this is about a high school girl who has a crush on a popular guy at her school. One day, she was kind of practicing her love confession in secret when a guy surprised her. I think he made fun of her and, if I'm not wrong, he had kind of light hair and had a skateboard (?). I think he was hiding from some girls who were looking for him and he's popular guy in middle school/ junior high. The girls end up seeing him with the high schooler, and later in class they harass him to know who she was and he ends up saying she is his girlfriend. Some of the girls crushing on him were so jealous they went looking for the HS girl and, upon finding her, they locked her up in a closet/cupboard, except she is claustrophobic.
One added detail that I'm not sure of is that the younger guy and the highschooler's crush know each other somehow, I think they're brothers or cousins or something like that.
I really hope you guys can help me, I've been trying to find this for ages!! Thank you so much in advance!

Peppermint perhaps...?

~4400 manga completed
~1700 ongoing...

YES THAT'S IT!! Thank you thank you thank you!!! I've read it so long ago and I never finished it, I also got most of the details wrong lol. I really can't thank you enough! 😖❤️