According to Amazon Japan, an OVA of Nazo no Kanojo X
was announced to be released on August 23rd. It will be bundled with the ninth volume of the original manga.
Nazo no Kanojo X anime official website
The TV series will start in April.
Mikoto: Yoshitani Ayako
(live action drama actress)
Akira: Irino Miyu
Kohei: Kaji Yuki
Ayuko: Hirohashi Ryo
Yoko: Fukuen Misato
Sources: Amazon Japan
Nazo no Kanojo X OVA