I know the ‘ha’ it’s the sound effect for hard breathing as Watanuki runs for his life but it also looks like the giant off screen ~mystery thing~ is just slowly laughing at him.
And I say ~mystery thing~ but it’s definitely Mokona.
GIANT MOKONA FINDS YOUR JOKES MODERATELY AMUSING, WATANUKI.
BUT ONLY MODERATELY SO.
NO MOKONA DO YOU KNOW WHAT THAT MEANS.
MOKONA N O.