Quick answer — Ayumi Takeo voices Yun Iijima in NEW GAME!, Mayuu Kanenashi in Scorching Ping Pong Girls.
Ayumi Takeo voices Yun Iijima (NEW GAME!), Mayuu Kanenashi (Scorching Ping Pong Girls).
Yun Iijima is voiced in Japanese by Ayumi Takeo.