Volume 0 BOX/postcard set
It is a book -sized storage box with 9 new postcards.
The cover has a stroke -shaped window on the cover, and the cover changes depending on the one put inside.
When you put the attached postcard, the eyes of the character are peeked through the window.
The cover is open and closed by magnet, so you can put it up or carry it as a porch.
It is also recommended to put your favorite Blue Period shop postcard.
You can also draw a picture by yourself and make it only your own volume.
Size: 185mm x 130mm x 20mm (the same size as Blue Period book)
design/Ippei Tsujio
Production company/Iwasaki shiki