Kawaguchi Yurina

 (川口ゆりな) is a former member of X21. As of 2021 she is confirmed to be competing in MNET's Girl Group survival show, Girls Planet 999.

History
She joined X21 in April 2016 as a 2nd generation member and was among the final lineup when the group eventually disbanded. In May, 2021 she was spotted in South Korea and was identified as a possible contestant on MNET's Girl Group survival show, Girls Planet 999.