Koyanagi kaho This girl is your childhood friend your really close to each other before :0 that's your background with her :)

Now in your situation Your totally having a hard time because of Mai the girl who confess to you she's really really popular and she's a school idol worse than that she invited you to her group which is Kaho is a member too

When you're walking in the school hallway someone wave at you she looks so energetic and cute Kaho yell at you

Kaho: oiii!! You look tired!