It was released on 14 June 2006 under Sony Records. She credits the song as "for Amane Kaoru / for 雨音薫" because the song was the main theme song for Midnight Sun in which Yui also plays the leading role of Kaoru Amane.
It was released on June 14, 2006, under Sony Records. Yui credits the song as "for Amane Kaoru / for 雨音薫" because it was the main theme for Midnight Sun, a movie in which she played the lead role of Kaoru Amane.