Shinobu is a naive ninja who is still learning the ropes. She must take the panties of all the high school girls in order to put her ninja skills to the test. The first residence she visits is that of Kaede Shiranui, who happens to witness Shinobu's deception. Despite a round yellow ball-thing who purports to be a ninja master and tries to get in the way of their friendship, Kaeda is the voice of reason, and the two girls become fast friends. Comedy is a comedy genre.