レベル別日本語多読ライブラリー (Japanese Graded Readers)

The content of the book is great. The publisher say it's around N3, but I believe solid N4 learners should still be able to understand it (grammar and vocabulary wise). I didn't give five starts because it has Furigana for ALL Kanji (even for simple ones as 人、何). I understand that it is there for level 0-2 but at the 3/4 book, I would expect that someone who understands it should be also able to read some basic Kanji.