Unfortunately, I don't have time to actively play :( Throughout the game, I haven't been able to play much due to a lack of time...

I tried to "investigate" based on the clues, but I didn't find anything...

I'll share a few thoughts about Ara.

On the 3rd day, he lobbies everyone to vote for Kostyan's execution, but at the end of the voting, when he realizes that he's going to be killed anyway, he changes his vote.
The next day, when everyone executes GamYun, Arandor joins in at the very end (he hoped for a miracle until the last moment).
He constantly pretends to be worried about his life, as seen in his notes. It's as if a Unicorn with no protection and a negative status would be targeted and killed by the Mafia, when there are stronger town roles available.

P.S. Hermit, analyze the situation, assuming that I am a town member and Arandor is a Mafia member ;)