Kitto Eien ni
- Crystal Kay
- Kitto Eien Ni (きっと永遠に; Surely Forever)
- Catalog Number
- Kitto Eien ni (きっと永遠に; Surely Forever)
- As One
- Kitto Eien ni -STUDIO APARTMENT REMIX-
- As One -REMIX-
- Kitto Eien ni -INSTRUMENTAL-
"Kitto Eien ni" is the 20th single recorded by Crystal Kay. It was used as the ending theme song for the 2007 film Boku wa Imouto ni Koi wo Suru, which was released three days after this single. The film is a live adaptation of the manga series by Aoki Kotomi. The single's B-side "As One" was used as J-Wave's Christmas campaign song for December 2008. "Kitto Eien ni" was also certified Gold by Recording Industry of Japan for for 100,000 full Chaku Uta downloads.
Oricon Chart PositionsThe single reached #12 on the weekly Oricon charts and went on to rank for seven weeks, selling 19,615 copies.
Total Reported Sales: 19,615