
Quick answer — Kana Marutsuka voices Ryouko Kunigawa in This Art Club Has a Problem!, Marai Heisenberg in Schwarzes Marken.
Kana Marutsuka voices Ryouko Kunigawa (This Art Club Has a Problem!), Marai Heisenberg (Schwarzes Marken).
Ryouko Kunigawa is voiced in Japanese by Kana Marutsuka.