In a press conference on the same day, member Jun Matsumoto expressed interest in releasing a 20th anniversary best-of album and a video collection.

By May 29, the majority of CD shops and online stores had sold out of its allocation of pre-orders and it was discovered that the album was being resold for higher than its suggested retail price.

[8] In response, J Storm arranged for additional production of the limited editions, available for pre-order from June 1 to July 12, to be shipped mid-August.

[14] On July 1, 2021, member Kazunari Ninomiya appeared on video on their SNS promoting the digital release of the album as a special version.

[18] On December 23, Arashi announced an additional 32 dates to the tour, bringing the total scheduled shows to 50.

1999–2009 sold 729,000 copies on its first day of release, breaking the record for the highest first-day sales by a male artist.

[22] It sold 103,000 copies on its third day, which brought the album's total sales to 1.099 million, making it the first million-seller of the Reiwa era.

[23] According to Billboard Japan, the album sold 740,114 copies from June 24–25, 2019, which set the record for the highest first-week sales in 2019.

[3] After only days of its digital release, the special edition ranked in 5th place with 4,015 downloads on the Oricon Weekly Digital Download chart, together with the four versions of the Ura Ara Best albums, making it the first time Arashi held the top five spots.