Experts know that ninjutsu did not die in the Tokugawa era, but slipped into obscurity, spreading rumors of its demise. Now ninjas serve the government and the most powerful people, training them under the guise of ordinary schools—Tokyo"s Handzo Academy is one of them. There, under a special program led by Kiria‑sensei, five girls are trained to become the next generation of shinobi: naive Aska, mannered Ikaruga, flamboyant Katsuragi, one‑eyed Yagyū, and sweet Hibari. Aska has just passed another exam, and to celebrate the event, sensei sends the students on what seems like a simple mission in the commercial district… It turns out that there are many ninja girls in Japan, and not all of them are obsessed with ideals of good, justice, and public service. Unknown opponents led by the dark‑skinned Homura didn"t even tense up; instead, they lightly tested the opponents" skills, leaving them in complete confusion. However, Handzo"s students soon calmed down, gathered their strength, and tackled the task seriously. Now the battle will boil over not for a joke, but for what—what"s the difference?! Let"s cheer for ours, because at least they all have a size four.