Can You Really Find a Wife by Writing Novels in Another World?

Cook is just an ordinary reincarnator. He has neither extraordinary strength nor a strong physique. Forget defeating the Demon King, he can't even beat a slime. With no chance of becoming a hero, Cook just wants to write novels, make some money, find a girl, and enjoy an ordinary life without a care in the world, finally fulfilling the wish he couldn't manage in his previous life.

He only meant to write some fun novels...

"Cook. The soldiers read your book and turned into death knights."

What?

"Cook. The Lion King of the enemy nation read your book. Now he's obsessed with his older sister."

What?

"Cook. The people of that country who were giving you trouble read your book. All the women are into women, and all the men are into men. That country is done for."

What?

How did he somehow become known throughout history as the mastermind behind the production of 'nation-destroying weapons'?