Histoire
The original manga revolves around Kohina, a little girl who ends up summoning by a Kokkuri-san, a lower-ranking ghost in Japanese folklore. The Kokkuri-san she calls ends up being a white-haired handsome, young man. Although he had intended to merely haunt her at first, he becomes worried about her terrible eating habit of cup ramen for every meal, so he decides to haunt her in order to protect her.
Synopsis via AniList (en anglais).