Why must the devil be Defeated? - Chapter 240 - 239 days so terrifying

He lived from BC to the Middle Ages, from the Renaissance to the Industrial Revolution, and from Cyberpunk to the Interstellar Age. He has been a king and a prophet, a knight and a nobleman, a versatile artist, a genius inventor…
This is a four-thousand-year human epic——
“To us four thousand years from now:
“Is the world at peace? Is famine extinct? Can people touch the stars? How long is the human lifespan? How far is the boundary of the earth? Human…do you remember us?”
——Excavated from Earth Age Tenth Century BC, Solomon Prayer Book.

- Description from novelbuddy

I became the Heavenly Demon’s dog.

One day, Katsuragi Daichi and his classmates found themselves in a different world. The god who summoned them to another world divided its power and gave it to them, saying that it wanted Daichi and the rest to defeat the Demon King as heroes. However, Daichi alone was given no abilities. And sure enough, Daichi was thrown away and used as a decoy in a demon’s den. Eaten by a demon, Daichi had lost consciousness and thought he had passed away, though when he came to he noticed his statuses had skyrocketed. He had obtained『Revenge of the Resented』. Every time he died, his abnormal ability powered up.

Kael, a former professional player of “Netherworld’s Gate” club, crossed into the game before it launched and became a Mixed-Blood Succubus. However, Kael always felt there was something not quite right about the way he raised the Fourth Calamity(player) as leeks for harvesting. Other NPCs’ methods of reaping players’ leeks: Unfathomable strength, top-tier plot backgrounds, hidden stories, and various skill teaching methods. His own method of reaping players’ leeks: An innocent yet desirable face, a small pink tail, eyes emitting hearts, skills with off-the-charts glamor… along with a turn-back-and-smile from the game’s promotional video. Wait a second, did I get something wrong with my great adventure in the game world? This book is also known as: “Succubus Reincarnation: Show Your True Skills in The Game World”, “The Common Succubus’s Cultivation Method”, “My Succubus Growth Monogatari is Surely Problematic”!!! Keywords: 【Fourth Calamity】【Kindombuilding】【Lord】【Dungeon】【Player】