"M" is the 19th single released by Ayumi Hamasaki on December 13, 2000, and is the first single from her studio album I am.... One of Hamasaki's most popular songs, this single sold 1,319,000 units in total, becoming Hamasaki's fourth million-seller as well as her third best-selling single, behind only "A" and "Seasons." This is the first song that she composed, under the pseudonym "CREA". Unlike the other singles "A," " H", and " &" which are only the titles of their respective singles and are not actually songs, "M" is a song.