第1章 人在泰拉，刚成魔王

In Terra, I just became a demon king

[Invincible] + [Multiple Heroines] 
Roy, having traveled to the continent of Terra, discovers he's the only remaining test subject from the former Cradle of Humanity Project. 
The Demon King's crown appears between his horns. Having struck a deal with successive Demon Kings, he resolves to end Kazdel's civil war. 
Under his spell, Originium disease is no longer a terminal illness, and with the anti-Originium device, natural disasters are no longer a threat to civilization. Kazdel ushers in its own era of two kings. 

Roy: Strength is the foundation of national security, and technology is the path to national development.

【无敌向】+【多女主】
穿越到泰拉大陆的罗伊，发现自己成为前人类摇篮计划仅剩的实验体。魔王的冠冕出现在两角间，与历代魔王达成交易的他，决定终结卡兹戴尔的内战。
源石病在他的法术下不再是绝症，天灾在反源石装置下不再是文明的威胁。
卡兹戴尔迎来自己的双王时代。
罗伊：力量是保护国家安全的基础，科技才是国家发展的道路。