Nisekoi Doumei.

Aizawa-kun is my fake boyfriend, my partner in our sweet, secret crime. One fateful day, in a classroom after school, we saw his girlfriend and my boyfriend stabbing us both in the back. That's where our relationship as co-conspirators started. As an imitation of theirs. Our relationship is sweet, but painful. Within the lie, I feel a twinge in my heart from my true feelings. This is our love story.

(Source: MangaBox)

Note: this entry is for the ongoing webcomic serialized on E★Everystar platform and not the completed 2-volume release.