Hirajima Natsumi (平嶋 夏海) was born on May 28, 1992 in Tokyo, Japan. She voices Seto Rika and is a member of Merm4id. She is affiliated with One Eight Promotion agency. Natsumi made her debut in October 2005 as a member of popular idol group AKB48. She created many albums with the group, as well as a sub-unit called “Watarirouka Hashiritai 7”. Years later, she was involved in a scandal due to having violated the “no-dating rule”. As a result, she decided to retire from AKB48 and Watarirouka Hashiritai 7.  After her departure from AKB48, Natsumi continued her showbiz career mainly as an actress, gravure idol, and TV host.