The story centers on two neighbors and schoolmates, Nana and Kaoru. Nana is the glamorous vice-president of the student council, while Kaoru is a dull and virgin boy. However, an incident leads them to discover a shared interest in S&M.

The story centers on two neighbors and schoolmates, Nana and Kaoru. Chigusa Nana is the glamorous vice-president of the student council, while Sugimuru Kaoru is a sullen boy who still has his "V-card". They have discovered a shared interest in S&M. The second movie is not a direct adaptation of the manga. Instead, it covers a school trip to Nagano and a voyage of discovery at a mysterious cabin in the woods.