Nobodyknows debuted in 2003 on the Sony Music Associated Records label with the mini-album Nobody knows3. They have released several hit CD singles which include “Kokoro Odoru”, a song that was used as the second ending theme for the anime television series SD Gundam Force and included in the Nintendo DS game Osu! Tatakae! Ouendan. They released their first album, Do You Know?, in June 2004 and debuted at number one on the Japanese Oricon charts, a rare accomplishment for hip-hop groups in Japan.[1] In 2005, the group wanted to help aspiring local artists, so they organized the Nagoya Music Expo in September. The event brought in around 10,000 people.