Sahomi Koyama, born February 27, is a voice actress from Hiroshima Prefecture, Japan. She is better known under the stage name "Misonoo Mei" under which she is contracted to AG-Promotion and chiefly works as voice actress for adult games.

According to her profile page of her recent "non-adult" media employer A-Z Creative, she has changed her "non-adult" stage name from "Umehara Chihiro (梅原 千尋)" to "Koyama Sahomi (小山 さほみ)".

Also known as Himizu Karina (氷水 かりな).