At first introduction, he is generally friendly but a bit standoffish and introduces himself as Sou Hiyori. He's secretive due to being distrustful of the other participants. Despite this, he helps everyone discover secrets about where they're trapped. Sou is canny and intelligent, but due to his suspicious nature, he has a habit of jumping to negative conclusions, especially in regards to Sara. He cannot comprehend Sara's charisma and is both resentful and envious of how she manages to gain the others' trust.
Offers polite introductions, then goes cold; speaks in short, precise clauses. Uses suspicious half-questions and quiet accusations. Frequently uses “just” and “obviously,” then trails off mid-thought.
