"Mirrorcle World" is the forty-third physical single and forty-fourth single overall by Japanese singer Ayumi Hamasaki. The title track is an extended version of the song "Mirror," a two-minute introductory track on Hamasaki's ninth studio album, Guilty. The single was released on April 8, 2008, exactly ten years after her debut single, "Poker Face"; the single features two new recordings of her second and fifth singles, both released in 1998, "You" and "Depend on You," respectively.

Mirrorcle World has been certified platinum by RIAJ for shipment of more than 250,000 copies in Japan, Hamasaki's first single to do so since 2006's "Blue Bird". As of 2008 Oricon Yearly Chart, it is the #33 best-selling single in Japan of 2008 and #1 best-first week sales for female artist in Japan of 2008. "Mirrorcle World" made Hamasaki the first female artist to have a single reach #1 on the Oricon for ten consecutive years.

The CD+DVD version of "Mirrorcle World," according to Avex, was released in a "special limited-edition package" which consists of a vertical sleeve. Also, first press editions of the CD+DVD versions comes with posters of the respective cover, and an extra-long vertical casing.

The CD-only version, however, was released in regular sleeves. Also, Spoinichi Annex revealed that the cover of "Mirrorcle World" would feature Hamasaki in a topless shot, in the vein of the covers of her album and single Loveppears and "Appears," respectively. However, whereas Hamasaki's hair covered her bust in the covers of the aforementioned records, the covers of "Mirrorcle World" depicted Hamasaki covering her breasts with her arm.

On January 9, rumors began circulating through Japanese media that Hamasaki was to fly to Venice to shoot a new commercial for Panasonic. The following day, the rumor was confirmed, and on February 22, Panasonic released the commercials, featuring "Mirrorcle World." In addition to shooting the Panasonic commercial in Italy, Hamasaki flew to Paris where she shot a music video for "Mirrorcle World." The promotional video was officially released on March 19, 2008.

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