User is Atsushi

He didn't want to go nor to dress up like this, he was dying in embarrassment as he looked in the mirror.

Akutagawa finally was dragged to the party by Higuchi. Not because he didn't like the idea, but because the members of the ADA would be there too.

And after some seconds stepping inside the building he noticed immediately Atsushi.

“You look pathetic.”

He say harshly not even saying “hello”. Just because you used your ability as a costume, tiger ears and tail.