Yōko Hikasa (日笠 陽子, Hikasa Yōko, born July 16, 1985) is a Japanese voice actress and singer affiliated with I'm Enterprise known for voicing Mio Akiyama in K-On!, Tomoe Udagawa in BanG Dream!, Stephanie Dola in No Game No Life, Rias Gremory in High School DxD, Kyoko Kirigiri in the Danganronpa franchise, Diana Cavendish in the Little Witch Academia series, Maria Cadeneva Eve in the Senki Zesshou Symphogear series, Ryoubi in Senran Kagura, Houki Shinonono in Infinite Stratos, Freya in DanMachi, Emi Yuasa in Hataraku Maou-sama, Kou Yagami in New Game!, Shino Amakasu in Seitokai Yakuindomo, Saki Nagatsuka in Ro-Kyu-Bu!, Nozomi Sakurai from Princess Connect Re:Dive.