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I bet he will fail again because Iruma will end up choosing his own path too. But the roller coaster of emotions and the backstory of Mephisto are awesome! Also, every time they show us the past interactions with Delkira, I can't help but get excited. They're really hyping it up, and I'm loving every panel.
Also, I know everyone has their own theories, but I want to share mine as well.
A. Iruma is Derkira but became human due to a scheme or maybe by his own choice.
B. Derkira is Arikred and so does iruma. They're all part of a whole. Derkira was separated into different pieces, with Iruma being one part that got separated from the original body and turned into a human. Arikred got the power and iruma got the heart and greed.
C. Iruma and Delkira are different entities living in different worlds but are connected like soulmates (not romantically, of course; search the definition of soulmate for better understanding). Derkira can probably see or feel Iruma's presence and his world, which is why he knows about Earth.
D. Derkira is Iruma's father or someone who is blood-related to him.
E. Derkira was originally a human who met the ring, which now calls itself Arikred, and was turned into a demon. At some point, he got himself reborn.