is the thirty-third single by Japanese recording artist Ken Hirai

Ken Hirai

is a Japanese R&B and pop singer. Since his debut, Hirai has worked as a model, actor, composer, lyricist, singer, and spokesperson.During his career, Hirai has released 32 singles and 11 albums up until October 2010. According to Oricon, his single Hitomi Wo Tojite became the best-selling single...

. The song was written and composed by Hirai and production was handled by Seiji Kameda

Seiji Kameda

is a Japanese music producer, arranger and bass guitarist.He is currently the bassist in Ringo Shiina's band, "Tokyo Jihen".- Biography :He was born in New York city, and went back to Japan at one year after birth....

. It was released on November 10, 2010 as the fourth single from Hirai's eighth studio album Japanese Singer. "Aishiteru" serves as theme song for the movie Ghost: In Your Arms Again

Ghost: In Your Arms Again

is a 2010 Japanese remake of the 1990 American film Ghost. It is directed by Taro Otani and it stars Nanako Matsushima, Song Seung-heon, Mana Ashida and Kirin Kiki.-Plot:...

, a Japanese remake of the 1990 American film Ghost

Ghost (film)

Ghost is a 1990 romantic drama film starring Patrick Swayze, Demi Moore and Whoopi Goldberg. It was written by Bruce Joel Rubin and directed by Jerry Zucker.-Plot:...

. The single includes two B-sides: "Air Cameraman," written and composed by Hirai, and "Unchained Melody

Unchained Melody

"Unchained Melody" is a 1955 song with music by Alex North and lyrics by Hy Zaret. It has become one of the most recorded songs of the 20th century, by some counts having spawned over 500 versions in hundreds of different languages....

," a cover of the 1965 The Righteous Brothers

The Righteous Brothers

The Righteous Brothers were the musical duo of Bill Medley and Bobby Hatfield. They recorded from 1963 through 1975, and continued to perform until Hatfield's death in 2003...

 song, which was featured in the original Ghost.

The single was issued in both standard and limited editions. The limited edition was released in Enhanced CD

Enhanced CD

Enhanced CD, also known as CD Extra and CD Plus, is a certification mark of the Recording Industry Association of America for various technologies that combine audio and computer data for use in both Compact Disc and CD-ROM players....

 format and includes live footage from Hirai's Ken's Bar concert in New York and the music video of "Sing Forever."

The single debuted at number 10 on the Oricon

Oricon

, established in 1999, is the holding company at the head of a Japanese corporate group that supplies statistics and information on music and the music industry in Japan. It started as , which was founded by Sōkō Koike in November 1967 and became known for its music charts. Oricon Inc...

 Daily Singles Chart on November 9, 2010 and climbed to number 7 on November 11, 2010. It peaked at number 9 on the Oricon Weekly Singles Chart with 18,137 copies sold. The single ranked at number 24 on the Oricon Monthly Singles Chart for the month of November 2010 with 28,056 copies sold.

Track listing

Charts and sales

Chart (2010)	Peak position	Sales
Billboard Billboard (magazine) Billboard is a weekly American magazine devoted to the music industry, and is one of the oldest trade magazines in the world. It maintains several internationally recognized music charts that track the most popular songs and albums in various categories on a weekly basis... Japan Hot 100 Japan Hot 100 The Japan Hot 100 is a music singles chart in Japan. It is compiled by Billboard and Hanshin Contents Link ever since February 2008. The chart is updated every Wednesday at billboard-japan.com and every Thursday at billboard.com ....	12	33,063
Billboard Japan Hot Top Airplay Billboard (magazine) Billboard is a weekly American magazine devoted to the music industry, and is one of the oldest trade magazines in the world. It maintains several internationally recognized music charts that track the most popular songs and albums in various categories on a weekly basis...	18
Billboard Japan Adult Contemporary Airplay Billboard (magazine) Billboard is a weekly American magazine devoted to the music industry, and is one of the oldest trade magazines in the world. It maintains several internationally recognized music charts that track the most popular songs and albums in various categories on a weekly basis...	20
Billboard Japan Hot Singles Sales Billboard (magazine) Billboard is a weekly American magazine devoted to the music industry, and is one of the oldest trade magazines in the world. It maintains several internationally recognized music charts that track the most popular songs and albums in various categories on a weekly basis...	10
Oricon Daily Singles Oricon , established in 1999, is the holding company at the head of a Japanese corporate group that supplies statistics and information on music and the music industry in Japan. It started as , which was founded by Sōkō Koike in November 1967 and became known for its music charts. Oricon Inc...	7
Oricon Weekly Singles Oricon , established in 1999, is the holding company at the head of a Japanese corporate group that supplies statistics and information on music and the music industry in Japan. It started as , which was founded by Sōkō Koike in November 1967 and became known for its music charts. Oricon Inc...	9
Oricon Monthly Singles Oricon , established in 1999, is the holding company at the head of a Japanese corporate group that supplies statistics and information on music and the music industry in Japan. It started as , which was founded by Sōkō Koike in November 1967 and became known for its music charts. Oricon Inc...	24
Oricon Yearly Singles Oricon , established in 1999, is the holding company at the head of a Japanese corporate group that supplies statistics and information on music and the music industry in Japan. It started as , which was founded by Sōkō Koike in November 1967 and became known for its music charts. Oricon Inc...	210
SoundScan Japan Weekly Singles Nielsen SoundScan Nielsen SoundScan is an information and sales tracking system created by Mike Fine and Mike Shalett. Soundscan is the official method of tracking sales of music and music video products throughout the United States and Canada...	7