Basically why I don't really like supernatural mangas. Most of the time they lack plot. It wasn't romantic, nor scary, it was bland.
What do you mean lack plot? Most of them need a gripping narrative from the get go to draw people in, which is why most of them start in media res, during a typical day on the job for our protagonist.
The one-shot did a good enough job of setting up the characters and world within its pages to draw people in. Time spent scaring the audience or whooing them with romance promises of romance is just diminishing returns.
