First year at Shinju High School, Miku's childhood friend and one player of "Aishiteru Game" (I love you).
He has romantic feelings towards Miku.

The first step to winning the Love Game is saying “I love you.” So how do you lose? By admitting you’re in love!
 
Let the games begin! Since childhood, Yukiya Asagi and Miku Sakura have played the Love Game, where they try to fluster each other with a simple “I love you.” But after falling in love for real and refusing to admit it, neither of them can afford to lose this battle!
 
After leaving behind his image as a quiet nerd, Yukiya’s ready to break hearts and take names with the ultimate high school glow-up. Well, he’s really just got one girl in his sights - his best friend, Miku! Using her favorite shojo manga as his weapon, he’s ready to pin her to the wall and gaze at her with a perfect smolder. Will his moves get her heart racing?
 
(Source: Viz Media)

A One-Shot of I Want to End This Love Game published in Weekly Shonen Sunday 2022 issue 19