I Don't Know (Mika Nakashima song)
"I Don't Know" is Mika Nakashima's 26th single, released on July 23, 2008. It is a collaboration with owarai group Morisanchuu, released under the name Mica 3 Chu, and is her first single to be released as a CD+DVD format in addition to the regular CD only format.
'I Don't Know' is Mika's first English-language single. 'I Don't Know' and its B-side, 'Shut Up,' are sung entirely in English.Charts
