"H" also remains Hamasaki's last single to sell over one million units and is the only million-selling single on "Rainbow". It is her fourth single to sell over one million physical units, after "Boys & Girls" and "A" from "Loveppears" (1999), "Seasons" from "Duty" (2000) and "M" from "I Am...". Hamasaki's last highest selling single close to the one million physical sales mark was the next single "Voyage" which peaked at number one, but only sold an estimated 679,000 units in Japan and was certified double platinum.