Ristorante Paradiso, ACCA: 13-ku Kansatsu-ka Recommendations
From the same original author, Natsume Ono. Apart from the story itself, they are totally different genre, although both contain a bit of slice of life in it, I can see them heading totally different direction.
However, there is noticeable similarity inside the character design, especially the male character. If you enjoy characters with mysteriousness, 'Ristorante Paradiso' is also going to be an enjoyable romance for you.