Normally, the magicians in Clover's kingdom have a Grimoire or a magic book with a three-leaf clover logo on its cover. The three leaves are said to symbolize Fate, Hope, and Love. Above there is a rare Grimoire with 4-leaf clover, where the fourth leaf symbolizes luck. It is said that the first Emperor of Magic, who had saved the Clover kingdom from demonic attacks, was a Grimoire user of this four-leaf clover. In addition to 2 kinds of Grimoire, there is another Grimoire from the kingdom of Clover is very rare, namely Grimoire clover 5 leaf. Until now there is only 1 Grimoire Clover Leaf 5 is already known that is owned by Asta. 
Although Asta himself did not realize it, because the Grimoire black or black color is very shabby and dirty until the logo leaves are not visible clover. Unfortunately, this Grimoire is not a symbol of goodness, because the fifth leaf in Grimoire represents the devil. It is ironic indeed, Asta who aspires to become the Emperor of Magic, without realizing it actually get a demon Grimoire. But there is something even more ironic. Asta's Grimoire is referred to as the demon Grimoire, but for some reason the sword that emerges from within the Grimoire looks exactly like the Magic Sword used by the first Emperor of magic to defeat the devil. But, before we go into more detail about the mystery of Grimoire's Aston's fiend, we will first explain what Grimoire is. Grimoire is a kind of magic book that has a function to store all the magic spells belonging to its users. The magic spell, written in itself in Grimoire every time the owner trains or takes over a new stance. Well writing in Grimoire is either using what language, because the owner itself may not be able to read it. Especially for the forces obtained from the outside, such as a magic fairy, or other magical items. Because this book functions like a magic recorder, then when the user will use his magical powers, he does not have to recite long spells; he just needs to open the Grimoire page where the spell is written. If a wizard is lazy to practice or lazy to develop his magical powers, then the contents of his Grimoire are empty. In fact there is a Grimoire it only has one sheet that there is writing. This Grimoire will choose its own owner. And if he has chosen his master, then he can not be used by others. There is usually a special event every year to find a suitable Grimoire for a wizard. Every child whose age is 15 years old, will follow the event to be found by Grimoire that matches where, or his magic power.
