Ristorante Paradiso, Not Simple Recommendations
Both are short manga by Natsume Ono, focusing on main characters that have had a rough childhood and/or absent parents. Both have some romantic and coming of age elements, as well as similar bittersweet moments. The art is also similar. The main difference is that Not Simple is a bit more depressing, while Ristorante Paradiso has some uplifting moments.