Kaede is a normal school girl who was studying for her exams for school when suddenly she is interrupted by Shinobu, a girl who is a ninja-in-training, attempting to complete her exam. The problem is, in order for her to successfully complete her exam, she must steal one of Kaede's panties! 
In Kaede's attempt to stop Shinobu from stealing her panties, an unexpected friendship is forged between the two. Kaede soon becomes engrossed in Shinobu's world, surrounded by partying ninjas and a yellow pac-man like thing by the name of Onsokumaru, who claims to be the master of all ninjas! 
[Written by MAL Rewrite]

Shinobu is the only girl that goes to the secret Ninja Academy, which is presided over by a strange, yellow, ball-organism, Onsokumaru. While he knows nothing about being a ninja master, he loses no opportunity to exploit the dim but cute Shinobu. On a mission to steal all the panties from area high school girls, Shinobu meets Kaede who gets drawn into the surreal, ecchi, but fun world of Shinobu.
 
(Source: Anime News Network)

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