Kamonohashi Ron no Kindan Suiri: Season 2, Episode 12

2 - 12: The Case of the Highland Auberge Serial Murders (Part 3)

Ron is in a state of shock after a staggering revelation. He shows no reaction when a third murder occurs. Toto investigates, dragging Ron with him. When Ron recovers enough to help with the case, he tells Toto what he's decided to do.