Elf-san wa Yaserarenai.

A young man, Naoe Tomoaki, works as a consultant at a popular Seitai therapy clinic. He is in charge of the treatment of a woman on her diet course. But the woman is an elf from a different world with sharp ears and a bow! Why are the elves, who should be slender, getting fat? And will her diet succeed!? (See "Related" tab for sequel series that continues the story after Chapter 47.)