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The day after the attack on Camelot, the members of Percival's squad are summoned to the audience chamber, where Meliodas and Queen Elizabeth offer words of congratulations. However, now that Percival, one of the Four Horsemen of the Apocalypse, has achieved his goal of arriving in Liones, Donny, Naciens, and Anne have a sad premonition...

Percival and his friends set out on a journey to find Camelot, and he can't contain his excitement. Meanwhile, Lancelot reunites with Guinevere, a mysterious girl staying in Liones, and learns her true identity, her magical powers, and the sadness she harbors...

After taking Guinevere to Camelot, Eloncid returns to his home. There, he is welcomed by a certain family, and shows a different side to his usual cold-hearted self. Meanwhile, Percival and his friends are on their way to the walled city of Walnack, but Arthur, who has used Guinevere's magic, finds out about their movements.

Percival and his friends attend the requiem in the walled city of Walnack, and reminisce about their loved ones who have passed away. Macduff and Teaninick, two assassins sent by Arthur, are closing in on them from behind. Meanwhile, Tristan, who was walking through the city with a mysterious woman, discovers her terrifying true identity...

Percival and his friends defeat Teaninick, an assassin from Camelot, and rush to reunite with their separated companions. Meanwhile, Anne and Jade are traveling with Isolde, who was poisoned during the battle, when another assassin, Macduff, stands in their way. A battle for each of their feelings is about to begin.

Percival desperately tries to hold the hearts of the others together after losing their precious friends and being torn apart. Meanwhile, in Camelot, Arthur, who has learned the results of the battle at Walnack, is plotting to send in more assassins. Percival and his friends want to find a clue and find Camelot as soon as possible, but...

To find a clue to Camelot, Percival and his friends come to the Demon World with Io, a member of the Demon Clan. When he sees the scene, Percival has a strange memory of having been here before. Meanwhile, the Demon Clan begins to move to capture the intruder. The one who leads them is...

Gawain fights alone against the assassins Mortlach and his men who have come to the Demon World to eliminate the Four Horsemen of the Apocalypse. Meanwhile, Percival meets one of the assassins, Rosebank, and tries to talk to him. At the same time, Tristan, who is in the Demon World's castle, receives information from the Demon King Zeldris about a door leading to Camelot, but...

While waiting for the end of the "Fire Moon" that causes fire rain to fall around Behemoth, the members of Percival's squad undergo intensive training from Lancelot. As they face the assigned task, Naciens and Anne once again come face to face with their own hearts and emotions. Meanwhile, as Tristan prepares for the next battle, he is summoned by Schwarz, a warrior of the Demon Clan, and challenged to a duel.

After unleashing a new form of his power, Percival continues training with Lancelot. Later, hitchhikers threaten the Knights' quest to find the Behemoth.

Percival is suddenly drawn into the world of spirits that reside in Behemoth and learns the origins of his existence. Unable to accept this truth, Percival returns to his original world, where Mortlach and others stand in his way. As the door to Camelot finally appears, the Four Horsemen of the Apocalypse, each with their own unyielding missions, clash with the knights of Camelot.