Watashi yori Tsuyoi Otoko to Kekkon shitai no: Seiso na Bijin Seito Kaichou (Jitsu wa Moto Banchou) no Himitsu wo Shiru Inkya (Jitsu wa Kanojo wo Koeru Saikyou no Yankee)

Akira Kogure, an introverted loner high school student, befriends the student council president Shizuka Takasaki, who excels in both academics and athletics and is blessed with beautiful looks from birth. Though their relationship may seem to be normal, both are keeping a secret that they can't reveal to anyone?! (Source: Kadokawa, translated)