[2] The band members each wear face paint and elaborate stage outfits and have adopted fictional personas for the purpose of theatrics.

This story culminated in 1999 with a series of three consecutive concerts called The Black Mass Final 3 Nights on December 29–31, with the last known as "The Doomsday".

In accordance to the fictional prophecy and after completing their "world conquest", the band disbanded after the third concert at the exact end of the century on December 31, 1999, at 23:59:59 JST.

In 2011, an encore of their world tour was held and the band hosted two charity concerts that included several different artists in response to the Tōhoku earthquake and tsunami.

It is also an abbreviation of the phrase Seinaru mono ni ueteiru akuma ga futatabi (tsū) yomigaeru (聖なる物に飢えている悪魔がII（ふたた）び蘇る, "the demon that devours holiness has resurrected again").

Seikima-II was formed in late December 1982 by guitarist Damian Hamada while he was attending the Waseda University Folk Song Club.

Although the exact date is unknown, Damian Hamada left the band soon after its formation, but remained a respected founder and songwriter throughout their career.

Zeed Iijima joined as drummer replacing Ace, who briefly left in October before returning as a guitarist that same month.

[5] The album's name was also the meaning behind Seikima-II (seikimatsu), as according to them, they were destined to disband at the end of the century (the year 1999).

That same year, a video game was released for the Famicom based on the band, under the title Seikima II Akuma no Gyakushū!.

This album brought about a change in the band's music style by mixing heavy metal with hard rock.

Also here for the first time, Luke Takamura takes on the role as more of a lead guitarist, switching off with Ace Shimizu, who is heard playing more rhythm guitar.

With this album they experimented with a fusion of heavy metal, progressive rock and even some jazz music to add for an interesting new sound.

Seikima-II's 1989 compilation album Worst made them the first Japanese metal band to reach number one on the Oricon chart.

[8] After releasing their next album Yūgai in 1991, the band began playing their first overseas concerts in surrounding Asian countries and in Europe, most notably England and Spain.

[7] In 1996, the Seikima-II released their next full-length album, Mephistopheles no Shōzō, leaving the CBS Sony label and signing to BMG Japan.

Xenon Ishikawa was involved in the band RX with Raiden and Seikima-II support keyboardist Yuichi Matsuzaki.

In late 2005, the final line-up of Seikima-II held two different kinds of reunion tours in Japan for the 20th anniversary of their debut.

The first tour included guitarist Jail O'Hashi, bassist Zod Hoshijima and enka singer Kiyoko Suizenji as special guests.

It was announced that guitarist Ace Shimizu, an original member of the band, would not be taking part and instead Jail O'Hashi would rejoin the group.

They included several different artists, them being Cali Gari, jealkb, Man With A Mission, Nokko, Kishidan and Rookiez is Punk'd, and were in response to the Tōhoku earthquake and tsunami.

The author of the original Terra Formars manga, Yū Sasuga, is a fan of Seikima-II and designed the cover of XXX -The Ultimate Worst-, which was drawn in finality by his partner on the series Kenichi Tachibana.

[20] However, on July 2 they announced that due to the COVID-19 pandemic in Japan, this was changed to events where previously recorded concerts would be screened and the members will be present for live discussions.

Taking place at 15 locations between October 11 and December 27, each venue was limited to half-capacity, with two "performances" held at each; one during the day and another at night.

The aesthetics and mythology of the band in manga/live action film/OVA series Detroit Metal City also appears to be largely based on Seikima-II.

Many notable artists cited them as an influence, including Tetsuya Kanmuri,[28] Go, Shinichi Kobayashi, and Nov from Zigoku Quartet,[29] Joe, Panther and Kenjiro Murai of Sex Machineguns,[30] Show-Ya,[31] Syu from Galneryus,[31] Shuse and Levin of La'cryma Christi,[32] Shouchikubai Shiratori from Kishidan,[33] miko of Exist Trace,[34] Kick the Can Crew's MCU,[35] and Hatake from Sharam Q.