Toshishun's story starts out like a fairy tale and ends with a life lesson. I wasn't a fan of some of the graphic discriptions but the ending pulled it up again. It's an easy read for those inbetween N3 and N2 with illustrations giving context for unknown words.
N3/N2 level is accurate.
Reading is slightly harder than the tadoku level 5 reader (or similar at least).
These are expensive, but worth the practice - and they come with native audio if you want to listen along!