Class no Inkya ni Kareshi no Sainou ga Arisugiru

When Kohane gets unceremoniously ghosted and dumped by her boyfriend, she's determined to move on and immediately sets her eyes on Mizuma, a bespectacled shy boy at school who's a dreamboat of a neighbor without his glasses at home. Mizuma is a reluctant rebound at first, but Kohane takes the fake it till you make it approach, conspicuously posing them as the perfect lovey-dovey couple in public. The sham relationship started out as a petty game of revenge, but could the rebound turn into true love?

(Source: Kodansha USA)