Episode Title:The Fairy King Waits in Vain.Episode Description:Centuries ago, Harlequin suffered amnesia as rescued from drowning by a young Diane with the two spending decades together in what seemed to be days from their perspective. Harlequin eventually regained his memories of leaving the Fairy King's Forest to rescue Helbram and their friends from a one-eyed man named Aldrich who knocked down a waterfall. When a nearby village was attacked, Harlequin promises to return to Diane and encounters who he thought was Aldrich. But it turned out to be Helbram, who was driven madly obsessed to kill every human, with Harlequin forced to kill his friend. Harlequin turned himself to the authorities after erasing Diane's memories of him and to take responsibility for Helbram's actions. In the present, King manages to kill Helbram, who can finally atone for his grudge against humans. Meanwhile, Meliodas comes to Arthur's aid when he is overwhelmed by Hendrickson.