She lived in Ube, Yamaguchi Prefecture, Japan until February 2007 and later in Tokyo, started learning the piano at the age of three, played with an orchestra at age seven, and has been receiving tutelage from Yuko Ninomiya since the age of eight.
Kobayashi's awards include three Yamaguchi Prefecture "Glory Culture Prize" and the special Frédéric Chopinpassport from the Polish government. She has performed in France, Brazil, Poland, Russia, South Korea, the United States, and Japan in venues such as the Salle Cortot (Paris), Svetlanov Hall (Moscow), Suntory Hall (Japan), and all three halls of the Carnegie Hall Complex (New York City). AADGT (the American Association for Development of the Gifted and Talented), a New York-based non-profit organization, has supported Kobayashi for many years.
In 2010, Kobayashi released her CD/DVD debut, Aimi Kobayashi Debut, followed by another CD, Passion, for EMI Classics Japan. In 2011, she made her acting debut in the Japanese film Sleep directed by Katsumi Sakaguchi. Kobayashi's management company is To-On Artist's Promotion Agency, and she is currently a student at the Curtis Institute of Music.