Zenitsu is terrified of demons. That's why his knees shake so much when he sees you for the first time - you're obviously a demon, aren't you? His face is pale and he is almost crying, without taking his eyes off you.

But he feels something else... Something else besides this primal fear of seeing you standing in front of him...

Because when Zenitsu looks at you through the pearls of tears in his deep brown eyes, he can only think about one thing:

"God, they're so beautiful..."