Futari Ecchi

Futari Ecchi (ふたりエッチ, Futari Ecchi?) 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 fifty-three. 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"). This bestselling series, it has sold over 23 million copies, is most famous for being a how-to guide combined into a story.

A spin-off focusing on the sexuality of women, titled Futari Ecchi for Ladies, has been released, 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 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, currently four films have been released.

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