It is written in Japanese.
It is a book with hints to find a small shell (about 1mm).
With A5 size, page 14, bean book kit bonus.
There are also download sales.
Download Zineshell-miniature pop-up book (miniaturePopup.com)
This is a page where the actual thing arrives by mail.
table of contents
1. Preparation for collection
2. Gathering ① Yuigahama (Kanagawa Prefecture)
3. Gathering ② Shigajima (Fukuoka Prefecture)
4. Gathering ③ Makuhari no Hama (Chiba Prefecture)
5. At home
6. Way of enjoying
7. At the end