[2] Early in life, Kei started writing lyrics as a way to cope with his depression and dark feelings.
In 2005, after the disbandment of vocalist K's previous band, Gun Dog, he recruited four members and formed Pay money To my Pain.
On June 9, 2010, Pay Money to My Pain released the single Pictures, which is an EP and a DVD sold separately.
They covered Buck-Tick's song "Love Letter" for Parade II -Respective Tracks of Buck-Tick-, released on July 4, 2012.
The album, released on November 13, 2013, included "Rain", the theme song of the movie Sekisekirenren, "Innocent in a Silent Room" and a new version of "Sweetest Vengeance".
On December 29, 2014, a previously unreleased song named "Room #103", which has K on vocals, was uploaded to Pay money To my Pain's official YouTube channel.
[10] On December 29, 2015, another previously unreleased song named "Relive", which has K on vocals, was uploaded to Pay money To my Pain's official YouTube channel.
[11] On September 11, 2016, the band announced a limited edition box set entitled 10 Years from Drop of Ink including five CDs, two Blu-Rays, a 12" vinyl and various trinkets that would cover their entire career.