no hesitAtIon is Kago Ai's first music release since she was featured on the 2005 single Miss Love Tantei formerly as a member of W. It's also her first solo retail single. The lyrics for "no hesitAtIon" and "Children of the night" were written by Kago herself. The song was produced by Nakanishi Keizo, who is most well-known for producing ZOO's (and later, EXILE's) big hit "Choo Choo TRAIN". It was released under in da groove records on June 24th, 2009.