Mousse might come up with new ideas in the future to make the Book-Book Fruit's abilities even more useful, but if he wanted to further strengthen the abilities he had already developed, he would probably have to rely entirely on improving his spiritual power. Now that his Devil Fruit ability had been developed to its limit, however, his spiritual power could no longer grow as quickly as before.
After all, Mousse's rapid growth in spiritual power had largely been thanks to developing the Book-Book Fruit's abilities. Without that cheat in the future, the pace would definitely slow considerably.
Still, Mousse was not particularly disappointed by this, because his spiritual power was already powerful enough that it had most likely surpassed even his own monstrous mother's.
In other words, Charlotte Mousse was probably now the person in this world with the greatest total amount of spiritual power and Haki. No exceptions!
What Mousse truly found regrettable was that the old problem remained: Book World still had not appeared. But that was no great matter. Since it was still like this even after the Book-Book Fruit's abilities had been developed to their limit, he could now be completely certain that his previous suspicion had been correct:
"It isn't that the Book-Book Fruit's abilities haven't been developed far enough for Book World to appear. It's that I've been developing them in the wrong direction."
However, just as Mousse was preparing to begin developing the Book-Book Fruit's abilities from a new direction, an unexpected incident interrupted him.
Come to think of it, Charlotte Mousse had not never considered that Nico Olvia might part ways with him. He had merely overestimated this female scholar's devotion to history, never expecting her to take her daughter and leave before even finishing the Flower Kingdom royal collection.
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