He has always dreamt about an SM relationship with his childhood friend and next-door neighbor Nana Chigusa, who is looked upon as perfect and is always the target of boys' eyes.

After Kaoru frees her of the one-piece, Nana soon discovers that the activity has caused her to relax and improve her academic performance.

The story takes place several months after the end of the main series and follows Nana and Kaoru during their vacation.

Over the course of the vacation, Nana and Kaoru encounter severe depths of S&M that they had never considered before, slowly taking a step forward in their relationship while also helping Sarashina and Mitsuko come to terms with their own feelings for each other that they have hidden with S&M for so long.

Written and illustrated by Ryuta Amazume [ja], Nana & Kaoru was serialized in Hakusensha's seinen manga magazine Young Animal Arashi from January 4, 2008,[3] to October 2, 2009.

[22] Two youth romance erotic films based on the manga were released, both directed by Atsushi Shimizu.

[56][57][58] An original video animation produced by AIC PLUS+, directed by Hideki Okamoto and with character designs by Atsuko Watanabe was released on March 29, 2011.

[68] Jean-Karlo Lemus from Anime News Network praised the first volume of the series, and described it as "While the story might have been off to a bumpy start, Nana & Kaoru sets up an enjoyable continuation.