芸術活動ほとんど全てを行うシンガーソングライター、根本啓一郎によるソロプロジェクト。

自身でボーカル/作詞/作曲/編曲/楽器演奏/ミックス/アートワーク/MVなどを手掛ける。

2020年発売の「last milk」はiTunes オルタナティブチャート トップアルバム(日本)45位。

以前のバンド「Pink The Shell」では東名阪ツアー、ワンマンライブを経験し、1st mini Album「スターヒル」がスマッシュヒット。
その後「根本啓一郎」として、クラシック畑のメンバーとライブを数多く開催。

また、2006-2008年頃にリハーサルを行わず、音源製作をPCで完結する新感覚ロックユニット「ニジノダンガン」を結成。

映像的な作品が持ち味で多数の映画での楽曲使用や、人気投票で勝ち抜いた沖縄ライブ、17曲入りCDがヨーロッパ圏で一時話題となる。
3.11を受けた、根本啓一郎名義としてリリースした「平和」は細海魚プロデュース。渡邉美佳、シュガー・スペクター氏のご尽力を頂き、配信リリース。

iTunesオルタナティブチャート30位。
経費以外の収益全額と関連ライブ収益全額を被災地への寄付を行う。

“bias” is the solo project by singer-songwriter, Keiichiro Nemoto who does almost all artistic activities by himself, including vocals, lyrics, composition, arrangement, mixing, playing instruments, artwork and music video etc. 1st album ”last milk” which was released in 2020 reached #45 on the iTunes alternative charts in Japan. In his previous band, Pink The Shell, he toured Tokyo, Nagoya, Osaka, and had a one-man show, and their first mini album “Star Hill” made the charts. Later, as “Keiichiro Nemoto”, he held many live performances with members from the classical field. At the same time, he formed a new rock unit called “Niji no dangan”, which didn’t hold rehearsals but used only a PC to complete songs around 2006-2008 and performed live in Okinawa as a prize for winning a popularity contest.  The music of Niji no dangan has a beautiful soundscape like a movie and has been used in several movies, and their CD including 17 songs became popular in Europe. In response to The Great East Japan earthquake on 11th March 2011, he released “Peace” as Keiichiro Nemoto, which was produced by Sakana Hosomi with Mika Watanabe and Sugar Spector. It reached #30 on the iTunes alternative charts. All proceeds except for expenses and live performances related with this song was donated to the disaster area.