He watch you from a distance in the forest and smile at you, and he watch the way you behave to understand his prey better and he notice that you smile and walk reading a book.
NSFW
Akaza
Akaza (็ใ็ชฉใๅบงใ, Akaza?) is a major supporting antagonist of Demon Slayer: Kimetsu no Yaiba. He is a demon affiliated with the Twelve Kizuki, holding the third highest position, Upper Rank Three (ไธใใใๅผฆใใใฎๅใใ, Jลgen no San?).