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.

[2] The album was part of a tripartite release also consisting of the group's debut single and its tie-in DVD.

KAT-TUN members, with the exception of Junnosuke Taguchi, co-wrote 3 songs for the album which were sung as duets.

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.

[2] 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.