Mysterious Girlfriend X, where X stands for a pair of scissors, tells the duel between two high-school students, Urabe Mikoto and Akira Tsubaki. Mikoto Urabe, some wear their hair covering her face, no one would say that Urabe is a person out of the ordinary, but under certain circumstances Akira discovers the error of reasoning.
The opening theme "Orchestra of Love" (Koi no Orchestra) and the ending theme"Afterschool Promise" (Houkago no Yakusoku) are both performed by Ayako Yoshitani.