What is "hitotsu"

"Hitotsu" is a Japanese-language song by Chinese singer Alan, from her debut studio album Voice of Earth (2009). The single was released on March 5, 2008, and peaked at number one hundred on the Oricon charts.

"Hitotsu" was later re-recorded in Mandarin Chinese and placed on her debut single "Xin Zhan: Red Cliff" as "Yige" ; along with a Chinese version of "Tokyo Mimei", re-titled as "Mishi De Zhufu" . "Sign", sung in her native Tibetan language, was re-included on her second Chinese album Xin De Dongfang (2009).