Anzu Hoshino requires only three things in her life: video games, chocolate, and her beloved cat. Unlike other high school girls, Anzu has neither the time nor the interest for romance. However, as she starts playing a poorly programmed 3D otome game, a bizarre flying wizard named Riri emerges from the screen and addresses Anzu as "subject one," the first person to experience a dating game harem storyline in real life. Despite Anzu's fiery protests, Riri confiscates her favorite possessions to force her to focus on love. Riri orchestrates a series of unlucky incidents and romantic clichés that lead her to meet Tsukasa Kazuki, one of the most attractive boys in her school. Still enraged, Anzu remains adamant about resisting Tsukasa's charm. As all the ridiculous fabricated scenarios help Anzu warm up to Tsukasa's pleasant nature, Riri throws other stereotypical pretty boys her way—and avoiding romance quickly becomes almost impossible.