Meliodas vs. Diane

Meliodas vs. Diene is a battle fought between the Seven Deadly Sins, Meliodas and Diane.

Prologue
As Meliodas learned that Cenette, Dr. Dana's daughter, he, together with Elizabeth and Hawk, headed to Baste Dungeon to save her. On their way to the dungeon, they encounter the wandering Diane who was confused and didn't remember what she was doing.

Battle
Diane, who had fallen for the Holy Knight Ruin's illusion, thinking her caption was Ruin, attacked him. Looking at her eyes, the young man immediately understood that she couldn't see them. As the three fled in order to avoid the fight, they saw shepherds and hid them along with themselves, since the civilians would have been caught up in the fight. As they hide, however, Meliodas falls for Ruin's illusion as well, and he, thinking Diane was Ruin, immediately attacked her by slashing from above, and then deflects the sharp pillars Diane sends toward him. Later, Diane is seen trying to stomp Meliodas with multiple hits, only for him to dodge all the attacks. When she compliments him for being strong even though he was a "midget" Holy Knight, he also compliments her for being fast though she was a giant Holy Knight. As their battle continues, Elizabeth screams, telling them to stop, causing Diane to regain her senses and recognize a young shepherd, whom she had met on her way to the Baste Dungeon. However, she was immediately hypnotized again, and attacked Meliodas, again thinking he was Ruin.

Aftermath
After Elizabeth removes Ruin's staff's bell, the object that allowed him to hypnotize Meliodas and Diane, he loses his hypnotizing abilities, resulting in both of them to regain their sense and stop fighting. The former then stops Ruin from killing Elizabeth and then defeats him.