It tells the story of the Knights of the Round Table and the quest for the Holy Grail from the perspective of Merlin and his relationship with Viviane.

According to the novel, Eve used the cup to collect Adam's blood from the wound created when his rib was removed.

[3] When the one true god came from Jerusalem to occupy the continent, the devil couldn’t pervert men anymore, so he impregnated a virgin with the goal of giving birth to an antichrist, but god, seeing that the child had inherited a pure heart from his mother, let him keep his devilish powers.

Now an adult, Merlin uses his powers to find a man of pure heart capable of finding the Aventureux Castle guarded by an injured king in order to bring back the Holy Grail, and with it, bring happiness and peace to man.

The courage, sincerity and above all love of them were all subjected to the difficult trials of the devil, and almost everyone ended up failing their quests.