This anime is based on a PC game, "ef ~ a fairy tale of the two" produced by minori, the software house that gave us "wind ~ a breath of heart~". The original characters are drawn by the popular artist Nanao Naru, known for being the character designer of D.C. ~Da Capo~ series. In the anime, two parallel stories are told simultaneously. One story is about a love triangle between Hirono Hiro, Mimura Miyako, and Shindo Kei. Hiro and Kei are childhood friends. Hiro was invited to a Christmas party by Kei, but meets Miyako that same night. Since then, Miyako chases him around. The other story revolves around Aso Renji and Shindo Chihiro. One day, Renji meets Chihiro at a train station. Before parting ways for the day, they agree to meet again the next day at the train station. However, why does Chihiro inquire upon seeing him if he is the person she met yesterday? Why does she wear an eye patch?