The Retirement Life of the Demon Cult Leader

Nowadays, everyone in the martial world claims the Sun and Moon God Cult is the strongest, what utter nonsense! If it was truly the strongest, the former leader wouldn't have used the opportunity to pass the leadership to me! That old geezer tossed a handover letter and ran away! I don't know anything except fighting, I can't possibly be the leader of this Demon Cult! No, no, I won't take this responsibility, I'm going to enjoy my retirement life now...