Leveling Endlessly with the Strongest System! - Chapter 142: Noah's intention

In a world where rank determines your worth, Adrian Vale awakened at the very bottom.F-Rank.In a single ceremony, he lost his fiancée, his status, and his freedom. Sold under the Civil Utility Act, he became a transferable asset—property in a society that worships strength.Then an S-Rank elf noblewoman purchased him.Not for love.For political marriage.Bound to the most powerful woman in the capital, Adrian is expected to remain silent, obedient, and insignificant. But the moment their hands touched, something awakened inside him—something the World Core never measured.In a society built on absolute hierarchy, he may have discovered the one flaw in the system.And the higher her rank…The stronger he becomes.

She, a genius abandoned by her clan. He, a proud, pampered, two-faced imperial crown prince, a developing supreme ruler of the world. She, tricking him, disguised as a pig to eat a tiger, suppressing him, provoking him. Every time, after playing with him and stirring him up, she’d escape.

No man could put up with this! He could only hunt her, pamper and indulge her, lure her into falling in love with him, who would have thought, the one to first fall in love would turn out to be him———-

A young man who stood above the world, a young lady who dominated the landscape, evenly matched opponents, evenly matched romantic game of chase and tag.

- Description from novelupdates

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

A series of short stories in the world of Toaru Majutsu no Index organized into chapters featuring Kanzaki Kaori as the protagonist, going around the world and space doing missions for the Church of Necessary Evil, however, there is more than meets the eye as each incident is connected.

One chapter was bundled with each limited edition release of the Toaru Kagaku no Railgun anime DVD and BDs, with all of them together being equivalent to a single normal Toaru Majutsu no Index volume