Osananajimi ga Zettai ni Makenai Love Come

is a Japanese light novel series written by Shuichi Nimaru, with illustrations by Shigure Ui. The series began publication on June 8, 2019 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
My childhood friend Shida Kuroha seems to have feelings for me. She lives next door, and is small and cute. With an outgoing character, she’s the caring Onee-san type, this being one of her greatest strengths.

…But, I already have my first love, the beautiful idol of our school, and the award-winning author high school girl, Kachi Shirokusa! Thinking about it rationally, I should have no chances with her, but, while walking home from school, she only talks to me, with a smile even! I might actually have a chance, don’t you think?!

Or so I thought, but then I heard that Shirokusa already has a boyfriend, and my life took a turn for the worse. I want to die. Why is it not me?! Even though she was my first love…As I was drowning in despair and depression, Kuroha whispered.

—If it’s that tough for you, then how about we get revenge? The best revenge ever, that is~

Anime
An anime adaptation of the light novel is due to release in 2021