ef
Ef: A Fairy Tale of the Two is an eroge by
minori. The intro sequence was animated by
Shinkai Makoto.
It was also adapted into a manga illustrated by Miyabi Juri, light novels illustrated by
Nanao Naru, Shouna Mitsuichi,
2C=Galore, and Shimotsuki Kinusa, and an anime by
SHAFT, titled ef - a tale of memories (エフ ア テイル オブ メモリーズ) and ef - a tale of melodies (エフ ア テイル オブ メロディーズ).