Futari Ecchi(ふたりエッチFutari Ecchi), also known by other names Manga Sutra, Step Up Love Story or Manga Love Story, is a manga series by Katsu Aki. Futari Ecchi is a story about a newlywed couple in their mid-twenties, both virgins when they married. The story chronicles their sexual explorations. The manga combines pornographic elements with factual and informative statistics. The title Futari Ecchi ("two person ecchi") is a play on a slang term for masturbation, hitori ecchi ("single person ecchi"). This bestselling series is most famous for being a how-to guide combined into a story. So far, forty tankōbon have been released. Two other volumes are set around the sexuality of women, called Futari Ecchi for Ladies, and there is an art book entitled Yura Yura. A four-episode anime OVA series