"Best of KAT-TUN" is the debut album by Japanese boy band KAT-TUN, released in Japan on March 22, 2006 by J-One Records. Despite the title, it is not a greatest hits compilation album. Seven songs on the record, however, were part of KAT-TUN's live tour set list prior to their debut and were already familiar with longtime fans.
The album was part of a tripartite release also consisting of the group's debut single and its tie-in DVD. All three releases were immensely successful on the Oricon albums, singles and DVD charts with "Real Face" and "Real Face Film" being certified as the best-selling single and domestic music DVD of the year respectively. The album itself was the eleventh best-selling album of the year.
Most of the songs on the album were written for KAT-TUN either by in-house Johnny's Entertainment songwriters or lyricists with a track record of successful hit records for other artists. KAT-TUN members, with the exception of Junnosuke Taguchi, co-wrote 3 songs for the album which were sung as duets. All rap lyrics were also written by Koki Tanaka himself.
In its first week of release, Best of KAT-TUN sold 556,548 copies in Japan, the highest first-week sales for the group to date. The album actually debuted at number 1 on the Oricon daily album charts the day before its release since its official release date fell on a national holiday. Therefore, it didn't officially chart for the week. KAT-TUN were awarded six awards at the 21st Japan Gold Disc Awards (the Japanese equivalent of the Grammy Awards) with Best of KAT-TUN named on "The Best 10 Albums (Domestic)" list. Soon after the home success, Best of KAT-TUN was then released in Taiwan and Thailand in 2006 by EMI Taiwan and EMI Thailand, respectively.
It stayed on the Oricon Top 30 Albums chart for 7 weeks with a total of 743,359 copies sold at the end of its chart-run. Oricon certified the album as the 11th best-selling record of the year and was later certified Triple Platinum by RIAJ denoting over 750,000 shipments.
<small><sup>1</sup> Kazuya Kamenashi and Junnosuke Taguchi duet.<br/> <sup>2</sup> Koki Tanaka and Yuichi Nakamaru duet.<br/> <sup>3</sup> Jin Akanishi and Tatsuya Ueda duet.</small>
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