While diligently studying for her exams, Kaede's peaceful routine is disrupted by a ninja-in-training named Shinobu. To ace her own exam, Shinobu must snatch one of Kaede's panties. Determined to protect her undergarments, Kaede inadvertently forms an unlikely bond with the ninja. As she becomes drawn into Shinobu's world, Kaede encounters a slew of rowdy ninjas and even a strange, yellow creature named Onsokumaru, who proclaims to be the ultimate ninja master!