Question

What is the reason Diane joins the Seven Deadly Sins?

Answer 1

Diane joins the Seven Deadly Sins because she is seeking to clear her name after being falsely accused of a crime she did not commit. She believes that by teaming up with the Seven Deadly Sins, she can find the real culprit and prove her innocence.

Answer 2

Diane joins the Seven Deadly Sins because she is a member of the Giant Clan and initially joins the group to seek out King, her love interest who is also a member of the Seven Deadly Sins. She also joins them in their quest to restore peace to the kingdom of Liones.