Both Megu(Ba) and Ayumu(Vo) had been performed in each band before they met in 2002, and they formed a band `Zwei` in June 2003.
They made a major debut on May 26th 2004 with its song `Movie Star`.
`Zwei` means `Two` in German, but it is the meaning the duo which is two different material harmonized. It is a duo which the one and only to make a sound, a vocal and the bassist which is composed natural emotions and aggressive emotions.
*They released `Mephistopheles no mokushi` from 5pb. Records.
*They released `Kakuchou place` which is main theme of game product `ROBOTICS;NOTES` in June. They also released `JunJou spectrum` which is main theme of TV animation `ROBOTICS;NOTES` in November.
*They performed at German event`AnimagiC2013` as a guest artist.
*They performed the biggest animation song event in Japan `Animelo Summer LIVE` in 2012 and 2013 for 2years in a row.
*They released `Brave the Sky` which is collaboration song with Kanako Ito.
And also released main theme of PS Vita Game product `ROBOTICS;NOTES ELITE`.
*They performed `AnimagiC2014` for 2years in a row.
*As one of Dutch organizer praised their performance glowingly at those event, they were invited to the Dutch animation convention `ABUNAI2014`.
*Now they are performing their activity both in Europe and in Japan.
*They performed `AnimagiC2015` for 3years in a row.
*They performed at Malaysia event`ANIMANGAKI` as a guest artist.
*They performed `AnimagiC2016` for 4years in a row.
*They released `Red Zone` which is ending theme of TV Animation `TERRAFORMARS REVENGE` in April.
*They performed `Animelo Summer Live 2016 刻 -TOKI-` in Japan.
*They will release ending theme of Japanese animation `SOUL BUSTER` which is named `MY OWN LIFE`(broadcasted in Oct.2016).
*They performed at Korean event `MU:CON` in Oct.2016
*They performed at `YAON of NAON`, too. It was produced by the Women’s band named `SHOW-YA` which are the legendable women rock band in Japan.
*They released their original album ’Ley Line’ in June 2017.
**In August, they performed `AnimagiC2017` for 5 years in a row. They performed with a full band.