Metafive was a Japanese band that consisted of Yukihiro Takahashi, Keigo Oyamada, Yoshinori Sunahara, Towa Tei, Tomohiko Gondo, and Leo Imai.
[8] However, after controversy arose surrounding Oyamada's past history of bullying (resulting in his resignation from the 2020 Summer Olympics opening ceremony committee), the band cancelled the "METALIVE 2021" concert event that they had scheduled for 26 July 2021 at KT Zepp Yokohama, which would have been their first live performance in over 4 years.
The streamed concert video footage was recorded on July 26 at KT Zepp Yokohama with no live audience and a lineup consisting of Oyamada, Sunahara, Tei, Gondo, Imai, and Shirane (Takahashi announced on August 5 that he was taking a break from all musical activities to recover from brain surgery that he had undergone in the previous year).
As the album was released exclusively to ticket-holders for the "METALIVE 2021" stream, copies were sold for high prices on secondhand marketplace websites such as Mercari and Yahoo!
The lineup subsequently revealed that they had changed their name to "TESTSET" and would continue to perform live under this name, beginning with a concert at Ebisu Liquidroom on April 14 with THE SPELLBOUND.