A Jerk Can't Improve Overnight

Hanaura, a self-proclaimed jerk, is a bonified loner in his class. Suddenly, Tsuzuki, the most popular guy in school, confesses his feelings for him and kisses him...? For as much as he tries, Hanaura can't refuse Tsuzuki's advances, and when they're together, Hanaura begins to worry whether he can actually be of use to Tsuzuki, the perfect... This is a coming-of-age love story between two opposites: a high-spec elite and a cynical loner! (Source: MangaPlaza)

In Round 3 of the Kuzu series, Hanaura and Tsuzuki have started university. After moving in together, every day is sunshine and rainbows… Until the pretty-boy Matsuri appears, determined to take Tsuzuki for himself?! When the interloper declares war on Hanaura, will he take the bait and throw himself into a catfight over Tsuzuki?! (Source: Houbunsha, translated and edited)