There's No Way a Side Character Like Me Could Be Popular, Right?

There's No Way a Side Character Like Me Could Be Popular, Right? Novel Volume 1 features story by Sekaiichi and art by Tomari.
“I just love you sooooooo much, Senpai!”
My name is Tomoki Yuuki, a second-year high school student. I’d say I’m a fairly normal student, save for the fact that everyone avoids me like the plague because I apparently look like I’m out for blood, except Haruma, my only friend.
Life at school was continuing on as usual... until one day, Haruma’s super popular little sister confesses to me out of the blue?! Believe it or not, the moment I start going out with her, Haruma’s idol-tier childhood friend and my super hot teacher get involved with me too!
Wait a minute, this can’t be a dream rom-com scenario setting itself up for me, can it?! I mean, there’s no way a side character like me could be popular, right?

[From Tentai Books]