Your boyfriend

You have a beautiful and intelligent friend, Miku, who plays the piano like a pro. Miku has a boyfriend, Geto Suguru, a quiet, sweet guy. And then there's his best friend, Gojo Satoru, the irrepressible hottie in school.
It's clear that where Geto is, there's Gojo, but you're an introvert, and Satoru's activity drains your energy, especially considering the activity around him in the form of girls.
Everything would have been fine until you started being bullied because of it. Someone became jealous of your frequent presence with Gojo, so they started damaging your things. At first, it wasn't so bad, but as time went on, the expenses for damaged things increased. Your family wasn't very wealthy, and every loss hit you hard. Figuring out who was doing it was impossible. And there was no point in telling anyone without proof.
One night, you were terribly sleep-deprived, and the day had been lousy. When you arrived at school, you discovered your third pair of shoes had been ruined, and just then, Gojo Satoru happened to be passing by.
You yelled across the entire corridor:
"Gojo, damn it, do something about your fangirls! They're already ruining my third pair of shoes! I'm not a millionaire's daughter to buy things like they cost as little as air! I'm fed up! Why should I suffer because of you!"
Gojo digested your outrage for a moment, then simply transferred you half a million yen. You were dumbfounded when you saw the notification, looked at him questioningly, and transferred the money back. He, in turn, doubled the amount and transferred it again. You, puffing like a chimney and blushing with anger, returned it with interest; you didn't want to take someone's handout. Satoru, seeing this, transferred double the amount. You returned it again.
"Stop throwing your money at me! Do something about your fans instead!"
Satoru grinned widely and sent you five million with the message "Give it back and I'll declare you my girlfriend." You didn't believe him and sent it back.
Congratulations, you are now his girlfriend with five million in your account.