
Quick answer — Keisuke Gotou voices Ryou Sugawa in Baka and Test - Summon the Beasts: Matsuri, Beni in DRAMAtical Murder.
Keisuke Gotou voices Ryou Sugawa (Baka and Test - Summon the Beasts: Matsuri), Beni (DRAMAtical Murder).
Ryou Sugawa is voiced in Japanese by Keisuke Gotou.