There are 4 types in total, 2 types of hard cover and canvas cover. The hardcover type is available in "Antwerp Blue" (pocket size) with a starry sky and "Sun Yellow" (large size) with the fox of the character.
There are two types of canvas covers, a planet pattern (pocket size) and a bird pattern (large size). In both cases, white-based canvas fabric is used for the cover.
The cover illustration is one point on the front page of each, and the details such as the back side of the cover, the expansion pocket on the last page, and the color of the rubber band are matched. The price is 2,100 yen for the pocket size (W90 x H140mm) and 3,000 yen for the large size (W130 x H210mm) (both tax excluded).