Lit. [i]Mysterious Girlfriend X[/i]

A manga by [[Ueshiba Riichi]], serialized in Kodansha's [i]Afternoon[/i] from 2006 to 2014. Adapted into a Spring 2012 anime by Hoods Entertainment.

h4. Characters

* [[Hayakawa Aika]]
* [[Imai Momoka]]
* [[Oka Ayuko]]
* [[Tsubaki Akira]]
* [[Ueno Kouhei]]
* [[Urabe Mikoto]]

h4. External links

* "Official Site" [s]h[/s][s]ttp://kc.kodansha.co.jp/content/top.php/1000003011[/s] (Dead link)
* "Official Site (anime)":http://www.starchild.co.jp/special/nazokano_x/ 
* "[i]Nazo no Kanojo X[/i] on Wikipedia":http://en.wikipedia.org/wiki/Nazo_no_Kanojo_X
謎の彼女X