大谷雅恵 (Otani Masae) is a Japanese pop singer. She is a former idol under Hello! Project as a member of Melon Kinenbi. After Melon Kinenbi disbanded in 2010, Otani started as a solo singer under the name Otani Masae aka Himawari, a name she chose after announcing a competition on her blog for a new stage name. Her last release under this name is the 2013 single BOY'S. In addition to her activities as a solo artist, she was also a member of the Korean pop cover group 4C Crew under the name MELODY from 2016 to 2017. She also worked as an instructor, in both vocals and dance, for the idol-themed café AKIHABARA Backstage pass.