The pocket-size book features the Arashi members traveling around Japan to rediscover, and navigate people through their home country. A larger version of the book was already given to various Japanese schools last August, but hasn’t been on sale until now. However, besides the size, the content of the two books is exactly the same.
Make sure to pre-order the book as soon as possible because it’s limited. On CD Japan it says “Since this product is extremely limited, only one copy may be purchased by a customer” while on YesAsia it’s already “temporarily unavailable”.