Mayumi Kojima (小島麻由美, Kojima Mayumi; born September 30, 1972) 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 North American Nintendo commercial for the Game Boy Advance and the video game Super Mario Advance 4: Super Mario Bros. 3, and "Poltergeist" (ポルターガイスト, Porutāgaisuto), which was used as the opening theme song of the anime Ghost Hound.
Source: “Mayumi Kojima”, English Wikipedia (CC BY-SA 4.0), excerpt