I Wish You Were My Muse

Every year, the school holds a contest to determine the school's No. 1 heroine/goddess/"muse." Jiyun's childhood friend Tsugumi Aiba was the winner of the previous year's contest. Jiyun had a crush on Tsugumi, but it wasn't reciprocated, so he wanted to do something as revenge for Tsugumi's rejection. That was when his inconspicuous classmate, Takahina Uzura, asked him to help her win the goddess contest...?

(Source: Pocket Comics, translated)