You-Zitsu: √Horikita

Yōkoso Jitsuryoku Shijō Shugi no Kyōshitsu e: √Horikita (ようこそ実力至上主義の教室へ √堀北) is a spin-off manga based on the original light novel series written by Shōgo Kinugasa and illustrated by Sakagaki. It's a story taking place in parallel world which focuses on Kiyotaka Ayanokōji and Suzune Horikita. The series had been monthly serialized on Monthly Comic Alive since June 27, 2017 and was finished on May 27, 2018 after total 13 chapters which is collected into 02 compilation volumes.

Synopsis
From volume 1's synopsis:

A what-if story focusing on Suzune Horikita, the cool beautiful girl from the popular school revelation

From 's hit, a what-if route where the protagonist, Kiyotaka Ayanokōji being attached to D-Class' lonely beautiful girl as the main story finally begins! Kiyotaka and Suzune, what the two will get, a happy ending or……?

Releases
The first compilation volume was published under 's MF Comic Alive Series imprint on November 22, 2017 when the second and final one was released on June 23, 2018.