As Percival turns sixteen, his grandfather tells him about the big world beyond their far-flung home - but the young man seems more interested in dinner.
On the way to Liones Kingdom, Sin experiences a peculiar dream. The next morning, despite a passerby's warning, the crew stumbles upon a strange village.
Percival faces off against Kellie, a powerful and merciless mythical beast. The crew chases Ardbeg into a mysterious cave, only to find out it's a trap.
Ardbeg's magic transforms Percival and his crew into helpless babies. The elder of the demon clan village comes to their rescue, presenting an ultimatum.
Arthur's men, hiding in the distance, ambush Gowther and Ardbeg. Restored to their original forms, Percival and his crew continue their perilous journey.
Arriving at Liones Kingdom, Percival and his crew head to the castle to meet the king. But they find him absent, and soon Percival strays into trouble.
The former king has an ominous dream about the Four Knights. Percival and his crew are introduced to Tristan and set off in search of the fourth knight.
Under Arthur's orders, powerful members of the demon clan wreak havoc in the kingdom. Meliodas seeks to uncover the truth behind King Arthur's motives.