Kiwamate Shinobu Kyoku

is a Japanese light novel series written by Taro Achi, with illustrations by Reko. The series began publication on September 10, 2012 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Kakeru Aizawa, 16 years old, has read "Ninja Goku no Maki", an absolute secret volume of the ninja industry. What appeared in front of him was a beautiful girl dressed in a ninja costume !?