Mami Kawada (川田まみ, Kawada Mami?) is a J-pop singer who is currently signed to Geneon Entertainment Inc. She is also a member of the I've Sound who performs soundtracks for some eroge. Mami was usually paired up with co-I've member KOTOKO when making soundtracks for anime. Examples of these are Onegai Teacher, Onegai Twins, Starship Operators, Shakugan no Shana, BALDR Force EXE Resolution OVA, and Hayate no Gotoku wherein KOTOKO will perform the opening theme while Mami will perform the ending theme or vice versa. Her debut single radiance which was released on February 23, 2005 was used as an opening theme for the anime Starship Operators. Her most successful single was JOINT, which was released on October 31, 2007 and used as the first opening theme for the sequel of the anime series Shakugan no Shana.

Source: Wikipedia