大阪城ホール
On January 31, 2021, the band launched a documentary series, "｢“her” Diary 2021 on YouTube｣," on their official YouTube channel. On March 3, 2021, the band released the single "Eternal"; in addition to being available via streaming and download, it was also released physically on CD, cassette, and vinyl in limited quantities. The band has also announced a "SCANDAL MANIA TOUR 2021" for April 2021 as well as their 15th anniversary concert, "SCANDAL 15th ANNIVERSARY LIVE [INVITATION]", scheduled for August 21, 2021 at Osaka-jō Hall.