Nintama Rantarou: Ninjutsu Gakuen to Nazo no Onna - Kore wa Jiken da yo! no Dan
Japanese title: 忍たま乱太郎 忍術学園と謎の女 これは事件だよ〜！の段
Type: Special
Source: Unknown
Episodes: 1
Status: Finished Airing
Aired: Mar 20, 2013
Duration: 43 min
Rating: G - All Ages
Studios: Ajia-do
Producers: NHK
Genres: Comedy

While Rantarou and Fushikizou are out running an errand, Fushikizou happens to spot a mysterious woman who's being chased by some of the Tasogaredoki Castle ninjas. It turns out the woman is actually the disguised leader of the Dokutake Castle ninjas, Hieta Happousai, and the entire Ninjutsu Academy ends up getting involved in the events.