Futari Ecchi (Japanese: ふたりエッチ, Hepburn: Futari Etchi) is a Japanese manga series written and illustrated by Katsu Aki. It has been serialized in Young Animal since 1997, with the chapters later combined into tankōbon volumes by Hakusensha, of which to date there are eighty-five. The series follows a newlywed couple in their mid-twenties, both virgins when they married, and chronicles their sexual explorations. The manga combines erotic elements with factual and informative statistics. Its title Futari Ecchi (“two person ecchi“) is a play on a slang term for masturbation, hitori ecchi (“single person ecchi”). The series has 29.5 million copies in print and is most famous for being a how-to guide combined with a story.

Two spin-off manga have been released, Futari Ecchi for Ladies focusing on the sexuality of women and Futari Ecchi Gaiden: Akira, The Evangelist of Sex focusing on Akira. There are also two sex manuals and an art book. The series was adapted into a three episode live-action television drama that aired on WOWOW in 2000. A four-volume original video animation (OVA) series was produced from 2002 and 2004. In 2011, a twelve-episode live-action web series was streamed on Ustream. Also in 2011, a live-action theatrical film series began. Four films have been released. A second three episode OVA series was released in 2014 by Production Reed.

In 2007, the manga series was licensed in North America by Tokyopop as Manga Sutra, only four volumes were released, comprising eight Japanese volumes. Also in 2007, Media Blasters licensed and released the OVAs on DVD as Step Up Love Story.

Futari Ecchi
Cover of the first tankōbon volume, featuring Yura Onoda
ふたりエッチ
Genre	Romantic comedy Sex comedy
Manga
Written by	Katsu Aki
Published by	Hakusensha
English publisher	NA Tokyopop
Magazine	Young Animal Young Animal Arashi (extra chapters only)
Demographic	Seinen
Original run	January 1997 – present
Volumes	85 (List of volumes)
Television drama
Directed by	Gen Yamakawa
Original network	WOWOW
Original run	2000
Episodes	3
Original video animation
Directed by	Hiroshi Ishiodori Yuji Moriyama
Written by	Chiaki J. Konaka
Music by	Jun Watanabe
Studio	Chaos Project
Licensed by	NA AnimeWorks
Released	July 26, 2002 – January 22, 2004
Runtime	28 minutes
Episodes	4
Manga
Futari Ecchi For Ladies
Written by	Katsu Aki
Published by	Hakusensha
Magazine	Silky
Demographic	Josei
Original run	December 2002 – October 2004
Volumes	2 (List of volumes)
Live-action film
Directed by	Kazuhiro Yokoyama
Written by	Juri Sanemura
Music by	Kentaro Nojima
Released	June 18, 2011
Runtime	74 minutes
Live-action film
Futari Ecchi: Second Kiss
Directed by	Kazuhiro Yokoyama
Written by	Juri Sanemura
Music by	Kentaro Nojima
Released	December 17, 2011
Runtime	70 minutes
Live-action film
Futari Ecchi: Triple Love
Directed by	Kazuhiro Yokoyama
Written by	Kazuhiro Yokoyama
Music by	Kentaro Nojima
Released	May 12, 2012
Runtime	74 minutes
Live-action film
Futari Ecchi: Love Forever
Directed by	Kazuhiro Yokoyama
Written by	Kazuhiro Yokoyama
Music by	Kentaro Nojima
Released	May 12, 2012
Runtime	70 minutes
Original video animation
Directed by	Tetsurō Amino
Studio	Production Reed
Released	October 10, 2014
Runtime	27 minutes
Episodes	3
Manga
Futari Ecchi Gaiden: Akira, The Evangelist of Sex
Written by	Monkey Chop
Published by	Hakusensha
Magazine	Young Animal
Demographic	Seinen
Original run	June 23, 2017 – November 24, 2017
Volumes	1 (List of volumes)