Kai Natsu, born on August 31, 1983. is a Japanese singer and songwriter. Born in Setagaya, Tokyo, she graduated from Tamagawa University. Her father is Yoshihiro Kai from Kai Band (甲斐バンド) and her mother is the former actress Kahori Takeda. She debuted as an indie artist with the mini album Yuugure Waltz (夕暮れワルツ) in May 18, 2005, and went major in 2007 with Namida no Seibun (ナミダの成分).
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