Is there a cap on the class mystery mastery books you can buy from the tempest shop?

Aren't the revelealed books tradable? Would just pop the mystery books open and trade the revealed books over.

You can only buy angelic buster books on your AB. Why? because it reveals for the class that opens it So your still going to need to farm coins for books on your AB, but you can use coins from different characters to get the tempest set or something tradable. Also, the special book will most likely be broken for AB like it was for luminous and Kaiser.

But i dont believe there is a limit, i did the same as Kagamine and used all except fail star.