Uke has trouble speaking to people and low self-esteem. Especially after he was transferred to the sales department where he has to interact with costumers.
He feels out of place and like all of his coworkers hate him and make fun of him.
Even when the top salesman, a kind and outgoing coworker, confesses to him, he doesn't believe it at first.
Slowly though, he is persuaded of the truth while also falling in love himself.
Kaeru no Prince-sama