Rio Okano (岡野 里音 Okano Rio, born on March 5, 1991, in Kobe, Japan), also known as Rionos, is a Japanese singer, songwriter, and music producer. She has provided the music for anime, video games and other singers. The name "Rionos" is derived from the nickname "Rio no Suke" that her friend called her.
Source: “Rionos”, English Wikipedia (CC BY-SA 4.0), excerpt