@Garett well because this Manga only Cover the Anime, not the Light Novel though it did more incline with the story line of Light Novel compared with Anime
@Garett According to the link provided by TehSDragon (http://www.crunchyroll.com/comics/manga/restaurant-to-another-world/volumes) there is a chapter 18.5 so that brings it up to a full 30 chapters