Ef: A Fairy Tale of the Two is a Japanese two-part adult visual novel series by Minori for Windows PCs. The first game in the series, Ef: The First Tale, was released on December 22, 2006, and the second game, Ef: The Latter Tale, was released on May 30, 2008. The opening video for the game was animated by Makoto Shinkai, and a majority of the music was produced by Tenmon, who has worked in the past with Shinkai and Minori. Female character design was by Naru Nanao of Da Capo fame, while male character design was by 2C Galore.

Dengeki G's Magazine is a Japanese magazine published by ASCII Media Works and sold monthly on the thirtieth that primarily contains information on bishōjo games, but also includes an entire section on anime based on bishōjo games, and serializes manga and light novels based on such games. The "G's" in the title stands for "Gals" and "Games". The magazine is known for hosting reader participation games whose outcome is directly influenced by the people who read the magazine; such games include Sister Princess, and Strawberry Panic!. Dengeki G's Magazine first went on sale on 26 December 1992 with the February 1993 issue under the title Dengeki PC Engine, which changed to the current title in 2002. A special edition spin-off version called Dengeki G's Festival! is published in irregular intervals and each issue focuses on a specific bishōjo game. Four other special edition versions under the Festival! name are Dengeki G's Festival! Comic, Dengeki G's Festival! Deluxe, Dengeki G's Festival! Anime, and Dengeki Festival! Heaven. Dengeki G's Magazine's sister magazine is Dengeki Girl's Style, which publishes information on otome games, targeted towards females.