In Different World with Naruto System (WN) - Chapter 42 Taijutsu training

The village girl who was close to death from illness was about to marry, and her suitor was a strong and hearty hunter.Having time-traveled to a poor and backward mountain village, she had resigned herself to the lack of three square meals a day, but was her new body already halfway into the grave? What's more curious was that someone still wanted to marry her despite being on her deathbed?Driven by curiosity, she went ahead with the marriage, eager to see who the unlucky sap was who'd lose his betrothal gifts and even the coffin money.Cradled in his arms, her body was thin as a rake, and she really wanted to ask him, “Husband, does holding me hurt your hands?”

Science and Technology Library: The supreme state of science is theology; an accidental rescue, let Chen Mo get a technology library that collects endless technology, the story begins…

- Description from xbiquge translation

Hunted for the Alchemical Book in her hand - Mu Ruyue wakes up in the body of a wastrel in Shenwu Continent - a martial arts dominated world.Her fiancé has jilted her in favor of her foster sister.Her father condones her abuse.Her younger sister wishes she was never born.And the whole country ridicules and insults her for being a first-rate wastrel.Wastrel? Not at all. With the Alchemical Book in her hand, what pills and elixirs can't she refine?Jilted? She'd rather marry the pure and innocent Ghost King, Ye Wuchen.----Mu Ruyue: Stop calling me Sister!Ye Wuchen: Can I call you Wife then?Mu Ruyue: Not that either!Ye Wuchen: (about to cry)Mu Ruyue: (sighs) Suit yourself.Ye Wuchen then leans forward and kisses the corners of her lips.Mu Ruyue: …Did a child just steal her first kiss?----Brother 1: Let her go!Brother 2: She is my mother, why should I let go of her!Brother 1: Don't ever think of robbing my mother!Mu Ruyue: Let me introduce you, Jing'er, this is your younger brother. Huang'er, this is your elder brother.Huang'er: Mother, this stupid boy bullied me. He's not my brother.Jing'er: Little guy, from now on, you must listen to me.Ye Wuchen: (How exactly do these two regard him? They dare fight over his wife in front of him...)

[The Demon King is Dead], a story in which the Demon King got immediately killed in the Prologue. I became the ‘Demon Prince’ of said novel.

…Help me.