Right now, series with individually graded books, that contain at least one a book with a temporary rating, are handled weirdly, giving some counterintuitive search results.
For example, if you search for “10分で読める名作 1年生” with the Series Results: “one volume only” option, the correct book shows up (10分で読める名作 1年生 | L17).
But if you do the same search with the Exclude temporary ratings checkbox on, the book disappears, because another book from the same series has a temporary rating.
The same thing happens with the Series Results: “series” option : series with at least one temporarily rated book never show up when “Exclude temporary ratings” is on.