
Quick answer — Yuna Taniguchi voices Manami Watanabe in You and I Are Polar Opposites, Kyouko Narita in Let's Go Karaoke!, Sakura Yamano in Those Snow White Notes and 2 more characters.
Yuna Taniguchi voices Manami Watanabe (You and I Are Polar Opposites), Kyouko Narita (Let's Go Karaoke!), Sakura Yamano (Those Snow White Notes), Nao Nanao (Ahiru no Sora), Gromazen R9 (Robot Girls Z).
Manami Watanabe is voiced in Japanese by Yuna Taniguchi.