Eighties Sweetheart Wife - Chapter 639: Turning Hands into Clouds, Covering Hands into Rain

When encountering demons, a young man with two horns on his head, red hair reaching his waist, and an extremely handsome appearance leads the demons to the front.

Youdou: Actually, I really don’t want to be a master of monsters. This profession is completely useless. My ideal is to become a magic stick…, bah, it’s to become a great onmyoji.

All the monsters: My lord, wake up, you are the leader of the monsters yourself!

- Description from novelbuddy

An Individual from Earth finds themselves in the Shinobi World, equipped with a Scientific System. From that moment, he delved into scientific research far ahead of its time.

[Hello everyone, my name is Amamiya Ren. This might seem like an abrupt self-introduction, and honestly, I think so too.][In fact, when I first heard my own name, I had a bad premonition. Fortunately, I didn’t encounter Shido Masayoshi or Akechi Goro.][But when I discovered that the high school I was going to attend was called Teitan High School, I knew I was in trouble.][I thought I had successfully avoided the traitor, but I didn’t expect that I couldn’t escape the god of death either.][Then, as I dug deeper, I found out more information that made my heart race.][I learned about Shinomiya, who is as renowned as the Suzuki family, and Sanzenin, which surpasses both Suzuki and Shinomiya.][But none of that is the main point. It’s Teitan High School alone that made me want to start writing a diary.]Putting down his pen, the boy turned his gaze to the prize pool.Naruto, Bleach, One Piece, Katekyo Hitman Reborn, Negima! Magister Negi Magi, A Certain Magical Index, Persona, Demon Slayer: Kimetsu no Yaiba, Marvel, Genshin Impact, Fate, High School DxD, Lord of the Mysteries…---All rights to the original content belong to their respective creators.Cover Pic: By akeisae, let me know in the comments if you want me to take it down.

Roy’s life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
…
It’s really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!