is the twenty-fourth single by Japanese artist Masaharu Fukuyama

Masaharu Fukuyama

is a Japanese singer-songwriter, guitarist, record producer, actor, radio personality, and photographer from Nagasaki, Nagasaki Prefecture. He is the best-selling male solo artist in Japan. He is a member of entertainment company Amuse, Inc. and is known for his low, deep voice. Among fans, he is...

. It was released on 20 May 2009. Keshin was used as the drama Majo Saiban's theme song. is a self-covered version of KOH+ single (collaboration with Kou Shibasaki

Kou Shibasaki

, born Yukie Yamamura, on August 5, 1981 in Toshima, Tokyo, Japan is a Japanese singer and actress.-Music career:Shibasaki made her debut in the music industry in 2002 with her first single Trust My Feelings, but she became recognized for her second single Tsuki no shizuku which was used for the...

) and is taken from his performance in Daikanshasai 2008. This single was released in three different versions – Limited Towel version, Limited DVD version and Normal version.

Limited Towel Edition

1. Keshin
5. Keshin (original karaoke)
6. (original karaoke)
7. (original karaoke)

Limited/Normal Edition CD

1. Keshin
4. Keshin (original karaoke)
5. (original karaoke)
6. (original karaoke)

Oricon sales chart (Japan)

Release	Chart	Peak Position	First Week Sales	Sales Total	Chart Run
20 May 2009	Oricon Daily Singles Chart	1
	Oricon Weekly Singles Chart	1	131,384	207,690	19 weeks
	Oricon Monthly Singles Chart	2
	Oricon Yearly Singles Chart	24