Quick answer — Toshiki Kumagai voices Sasaki-kun in Tatsuki Fujimoto 17-26, Hitoyoshi Yokoya in You are Ms. Servant, Takuto Ira in Apocalypse Bringer Mynoghra: World Conquest Starts with the Civilization of Ruin and 2 more characters.
Toshiki Kumagai voices Sasaki-kun (Tatsuki Fujimoto 17-26), Hitoyoshi Yokoya (You are Ms. Servant), Takuto Ira (Apocalypse Bringer Mynoghra: World Conquest Starts with the Civilization of Ruin), Custas (Witch Hat Atelier), Raion Oono (Tasuketsu -Fate of the Majority-).
Sasaki-kun is voiced in Japanese by Toshiki Kumagai.
