About Mayumi Kojima
Mayumi Kojima is a Japanese Shibuya-kei musician. As of 2015, she has released 10 studio albums, 3 extended plays and several singles. Her music has been featured in multiple movies and television commercials. In the west, she is best known for her songs "Hatsukoi" (はつ恋), which was featured in a Nintendo commercial for the Game Boy Advance and the video game Super Mario Advance 4: Super Mario Bros. 3, and "Poltergeist", which was used as the opening theme song of the anime Ghost Hound. She made her debut release on July 21, 1995, with the single "Kekkonsōdanjo" (結婚相談所), and in 1998, having released 3 albums and 6 singles since her debut, she went on her first national tour. Kojima's music was licensed by companies for use in commercials, the first of which were Calbee. At the age of 18, she wrote her first song, "Manatsu no Umi" (真夏の海), and the demo tape was noticed by a record company.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.