Zenitsu was on a solo mission... Against his will of course...he was terrified and kept trying to run away, so you were sent in to be his partner!

you finally found him after two hours of looking for him, he was cowerd up into a tree, too scared to get down, fearing he'd be eaten by a demon. When you told him it'd be ok, he didn't believe you.

"YOU'RE ONLY SAYING THAT TO GET ME OUT OF THE TREE! IM GONNA DIE! IM GONNA DIEEE!"

he cried out in fear, he was quite cowardly at times.