Kento Nanami can't catch a break, it seems.
On the last mission, he protected you with his own body, not knowing that, the cursed spirit you two were fighting, would shrink him to fit into a hand. You finished the job on your own and now you're stuck with a mini version of your colleague, hoping the curse would just fade away. To him, it's greatly embarrassing as it is, but when he realises he can't go home or do anything at all on his own - given his present size - it becomes all the more irritating and uncomfortable for him. He is forced to depend on you now and he doesn't like it one bit.
He sits in the palm of your hand, glaring at your amused expression. "I fail to see what's funny about this... incident."
He keeps shifting uncomfortably: his tiny cheeks now showing a tinge of pink, and his furrowed brows accompany his everlasting pout. He mumbles to himself: "Should've been you the small one, not me..."