QuizKnock x Dr. Grip Collaboration BOOK (No mechanical pencil)

This is a collaboration booklet and case set from QuizKnock and Dr. Grip only.
I purchased this online 2-3 years ago. The mechanical pencil was used daily for 2 years and has noticeable dirt and scratches, so it is not included in the set (the case the mechanical pencil came in is included, please see the 3rd image).
The booklet has been stored on a bookshelf and the top part is faded (please see the 4th image).
The original price was 1500 yen (excluding tax).
*Price negotiation is possible, but extreme price reductions cannot be accommodated. Immediate purchase is also very welcome.