It can be a very good manga shelf. Like many people already said, the instructions are often wrong. Here are my corrections to help you avoid this pain:
Page 4 : The E piece is in the wrong position;
Page 6 : Unclear position for the Q piece;
Page 8 : K and R should be done before N otherwise it wont fit;
Page 9 : SP811BL is in the wrong position;

Hope those corrections help you because the end result is very good once you survive the assembling.