Zero no Tsukaima - Volume 20 Chapter 6

Xin Yun, a sarcastic young man, traveled to an unknown world by chance, but lost his chance to become the strongest because of his obsession with women... or sex. In a collision of the powers of nine powerful men, an incredible thing happened. Xin Yun was reborn back to the time when he traveled to the Isekai world. A fantasy journey is about to begin... [The comic adapted from this novel is popular all over the world]

The protagonist of the collapse of the three former civilizations is Dr. Mei. What is the end of logic, the strongest brain, super intelligence, this is the story of the strongest scientist of Honkai with knowledge of the moon becoming the god of science!

- Description from novelbuddy

She, the “godly doctor” of an assassin organization in 21st century, transmigrated into the body of Yun Family’s abandoned, good-for-nothing Ninth Miss. Good-for-nothing? Then she’ll let the world see what a real good-for-nothing looks like. Summoners are legendary? Nothing is impossible in this world! She’ll become the first Magical Summoner.

That day the sun set and never rose again...............Author Spotlight:Chen Dong — WebNovel's legendary titan behind global phenomena like 'Perfect World', 'The Sacred Ruins' and'World of Longevity‘— returns with his most ambitious saga yet. Crowned among the platform's all-time greats, this master of epic worldbuilding has dominated fiction charts for many times, with multiple novels adapted into hit games. When this trailblazer drops a new book, millions brace for sleepless nights.