Based on the award-winning novel of the same name, this portrait of a group of vulnerable, variously wounded people — a depressed housewife, her high-school-aged lover, and his best friend, who is struggling to provide for himself and his senile grandmother — whose intersecting lives yield both sorrow and a fragile, yet enduring, hope for a brighter future.

News about the disappearance of panties is still being covered every day. Kyosuke still wears Aiko Completo's panties to battle evil. Meanwhile, Aiko has mixed emotions and decides to get her panties back. Kyosuke suffers from the loss of Aiko's panties and disappears, but his biggest enemy yet is about to materialise.

High school student Kyosuke Shikijo is the most talented member of the school's martial arts of the fist club. His late father was detective and Kyosuke share his father's strong sense of justice. Kyosuke also has a secret. Kyosuke likes to wear female underwear and transforms himself into the alter ego "Hentai Kamen," wearing female underwear and gaining superhuman powers. This unusual interest also comes from his parents, with his father a masochist and his mother a sadist. By chance, Kyosuke gets the underwear of female high school student Aiko Himeno. With her underwear, he gains various pervert techniques and attempts to protect Aiko from a dirty and heinous teacher.

The supernatural grudge manifests itself by way of a strange cyst growing in the body of a young woman, slowly draining all life from her in revenge for... what?