Saikyou ni Uzai Kanojo no, Ashita Kara Tsukaeru Mount Lesson

"The Pyramid" is a powerful social ranking method since ancient times.
At Saginomiya Private School, where the children of the upper class gather, it is an absolute caste system.
The only way to win is to climb the pyramid!

Sato Rei, an average boy, seems destined to be stuck in the lowest tier of the pyramid, doomed to spend the next three years being bullied by the rich and popular. The only way to survive is to move up to the S class. Suddenly, a beautiful, unfamiliar girl appears before him. Chisato Tsukinami kisses him out of the blue and tells him, "Be my boyfriend and we'll be at the top of the class."

"How!?"

Join forces with the most annoying girl in class and aim for the top of the school pyramid!

(Source: Gagaga Bunko, translated)

Note: A winner of the Excellence Award in the 16th Shogakukan Light Novel Awards.