An anime adaptation was broadcast in Japan in 2004, and originally ran from June 30, to September 22.The title references a haiku by Yosa Buson: "Nanohana ya tsuki wa higashi ni hi wa nishi ni."

ASCII Media Works published a manga adaptation for on January 27, 2005, serialized in Dengeki G's Magazine.

Every morning before school, he is awakened by his childhood friend, Honami Fujieda, who keeps telling him that he is not a child anymore, but still comes to wake him up.

This girl, called Mikoto Amagasaki, comes from 100 years in the future, and she went back in time with the intention of finding her brother.

An anime adaptation was produced by Radix Ace Entertainment, and directed by Mitsuhiro Tōgō and Shousei Jinno.

Four DVDs were released between October 22 and December 12, 2004, and additional four episodes based on Mikoto scenario were contained in volume four.