Considered legendary among old school visual kei fans, the group's vocalist Kon (ex-La'Mule) and guitarist Kaie (ex-WITH SEXY, Vasalla and many more) have played together for many years. They first played in geno, followed by Red Carpet and finally decided to create NightingeiL together in February 2008. They were joined by bassist Mukui in June and by July they had announced the beginning of their activities. From August, the band started playing lives with Kaie's ex-colleague Kei (ex-WITH SEXY) as their support drummer.
In September, they started selling their demo CD Shippai no boku seikou no kimi at their lives, soon followed by their first single you in November. The band continued touring Japan, playing their first two-man with 9GOATS BLACK OUT in Niigata in December.
In February 2009, the band was joined by two young members: Shouichi (ex-oshare dorobou) on guitar and Ayuki (ex-Hagakure) on drums. In April, the band played their second two-man, this time with ∀NTI FEMINISM, and continued to tour around Japan. The band's popularity continued to rise, and in August and October two more maxi-singles were released. On Kon's birthday in November, they played their first sponsored event.
The year 2010 started smoothly. However, drummer Ayuki became ill with a hernia and the band announced their first sold-out one-man on March 21st would be his last live. On May 21st, after a short hiatus, the band announced the birth of the new NightingeiL with new drummer Hakuya. With the new line-up, the band released their first mini-album Tsurisage no koi and performed their second one-man in August. It seemed as though things were looking up with the new line-up, but all of a sudden Shouichi left the band on short notice in the middle of a tour. The band seemed shocked by this occurrence, but they soon got back on track and continued their activities with a new sense of power. Once again on Kon's birthday in November, the band held their second sponsored event, at which they announced the release of their sixth maxi-single Suigin, and a third one-man for February 2011.
After releasing the maxi-single Dark Word in August, the band embarked on a six-month consecutive one-man campaign. The year 2012 started successfully with the release of another maxi-single, 12 byoukan, as well as the final one-man of their campaign. However, in March the band suddenly announced they would be disbanding. NightingeiL played their last live in Harajuku Astrohall on June 3rd 2012.
While Kaie announced that he was retiring from band activities, vocalist Kon soon reappeared with his new project CELL, paying tribute to NightingeiL by performing their songs at his shows.
