Mujakina shōjo wa ai o mitashimasu

This is a story of a girl named Koizumi Michiyo. She is 15 years old. And the only child of her parents. She is a nerd and a loner girl and thinks that "education is the only key to success" and "never trust anyone". She only cares for her own grades. Everyone thinks that she never had a best friend since she's alone all the time, just with her books. She's bullied and backstabbed by her schoolmates because of that. Until she met a bad-type-aura guy (feared-by-the-school guy) unexpectedly whom protected her unexpectedly and exchanged breathtaking stories behind their weird behaviors unexpectedly (which is also weird for a type of a guy to do so).