It Makes Sense for the Demon King to Summon a Hero to Defeat the Demon King, Right?

[Single female protagonist + pure love party must-see + micro natural disasters] This book could be called "The Demon King's Notes on Killing Demons" Peart became the devil, the lowest devil, and other devils looked down on him. He was so much like a human being. Therefore, most humans don't know that he is the Demon King. One day, he launched a summons, and the one he summoned was the brave man from the earth, or rather his fellow countryman...