I had never heard of Niji Iro Tougarashi until I saw it on another site and began reading, because it was fantasy, and I'd heard good things about Mitsuru Adachi. I was pleasantly surprised to find an engrossing story which alternates between slice of life and adventure elements. It's 109 chapters, but it reads quickly. I finished it in about 2 days. The characters are likable, although the ending seems a bit forced. It's frequently humorous, and it never really becomes dark like other shonen journeys tend to.