Hirajima Natsumi

 is a Gravure idol, voice actress and a member of Merm4id.

She is also a former idol, as a original member of AKB48 and the former leader of its sub-unit Watarirouka Hashiritai 7.

She joined AKB48 with their formation in December 1st 2005, she graduated from the group on January 17 2012, due to a scandal involving the Love Ban rule.