Hasegawa Rumi (長谷川瑠美) is a Japanese actress and former idol singer signed to Tristone Entertainment agency. She debuted in March 2006, as Koizumi Rumi, as a member of the one-time indies idol duo NO KISS. Later that same year, she became the #02 member of Idoling!!!. Less than three years later, in January 18th 2009, she graduated from the group due health reasons. She returned to show business in December 2011 under a new stage name and agency.
- Stage Name: Hasegawa Rumi (長谷川瑠美)
- Real Name/Former Stage Name: Koizumi Rumi (小泉瑠美)
- Birthdate: March 24, 1989
- Birthplace: Tokyo, Japan
- Blood Type: AB
- Height: 155cm
-  Ginza no Koibito-tachi ~Kimi wo Wasurenai~
-  Family Wars
- [2008.02.22] Rumi-hime!!! (るみ姫!!!)
- [2006.12.22] Tsubomi (つぼみ)
- [2009.01.30] Ohime-sama no Kyuujitsu (お姫様の休日)
- [2009.06.12] Tensho to Koakuma Maid (天使と小悪魔メイド)
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