Toaru Majutsu no Index - Volume 15, Chapter 4: The Paper-Thin Difference between Self Derision and Pride. Enemy_Level5.

This is a cliché story about two young people saving the world.

A story of time-travel. Sly and cunning, she unexpectedly became a sickly noble lady whose fiancé is merciless and demotes her to a lowly concubine. She sneers and bravely breaks off the engagement. To hell with scumbags, marry heirs to lords, blind the courts with her brilliance.

But, my Lord, we agreed that we are only partnering to scheme against others, when did you start to treat acting as real? Hey, hey, don’t touch me.

The Lord smiled slyly, “Your hands are too cold, let me help you warm them… Your feet are cold too, let me help you warm them.”

“Why don’t you just say that my whole body is cold and you need to warm it all up”, Murong Xue said indignantly.

The Lord nodded, “Good idea!”

Murong Xue – speechless. Hey hey hey, where, where are you putting your hands?

- Description from Novelupdates

The eldest daughter of the Yan family, Yan Jinyu, who has been missing for 16 years, has been found. She is brought back from an orphanage by her fiancé, the Second Master of the Yin family.

Masterpieces such as 'The Divine Comedy', 'The Theory of Evolution', 'Encyclopaedia Britannica', 'The Theory of Relativity'...Born in the history of human civilization, possess mysterious and magical powers in another world!Original sin, biological evolution, mastery of all arts...By reading the secret tomes, one can gain a variety of powers!The only trouble for the people of the other world is that they find it difficult to understand the texts from Earth.At this time, there comes a librarian from Earth...