Ohno is a tutor at a cram school who’s obsessed with math, and so introverted and shy he can barely hold a conversation. He wants to fall in love and get married, like a “ordinary” person, but it just doesn’t work out whenever he tries. Then his savior appears: a teenage girl named Kasumi, who knows all about “normal love”. Or so he thinks: it turns out she just knows a lot of trivia and has never dated in her life! The two of them team up to try and help Ohno in his romance! Their target is Minako, the daughter of a wealthy family. They use all of Kasumi’s knowledge to come up with the perfect plan based on Minako’s hobbies and habits, and the mission begins! But while Ohno’s making his moves on Minako, Kasumi was in fact on her own mission to get her Prince Charming who happened to be Minako’s fiancé…