Quick answer — Seiko Ueda voices Shinobu in Junji Ito Maniac: Japanese Tales of the Macabre, Naru in Kaiba.
Seiko Ueda voices Shinobu (Junji Ito Maniac: Japanese Tales of the Macabre), Naru (Kaiba).
Shinobu is voiced in Japanese by Seiko Ueda.