Elf Tensei Kara no Cheat Kenkoku-ki - Chapter 16Book 05: -1: The War Begins

Every twenty years, the world of Tower Defense arrives to take away people and make them participate in the survival game. You can get unimaginable rewards if you can win. You can also inflict severe damage to your country if you lose.

Pierce finds himself in this world, and sent to the Tower Defense alone, while other teams have a hundred people.

Fortunately, he awakens golden hint system. Not only can he see useful alerts, he can also discover the fatal weaknesses of his enemies. Every monster he takes down rewards him with top-tier prizes. While the other players are still struggling, he is already swinging his swords to take the lives of gods.

The tale of Oliver.
An orphan boy from a Mine, in 19th century Europe, filled with Magic.

The little princess of the Huo family, one of the wealthiest families, was mistakenly switched out nineteen years ago! The fake heiress is well-educated, talented, and doted on, while the real heiress is an uncontrollable girl who loves to fight, has a strange personality, and had dropped out of school very early…

[Double wear + era group pet + ability + space]

Jiang Zhiying, the female overlord of the last days, transmigrated into the villain female supporting role who kept dying and ended miserably in the era text.

My father is the future boss, but my mother is the boss’ best ex-wife. Grandpa’s family doted on her, but she was the villain in the book, and she would not end well in the future.

There is also a scheming heroine who always wants to rob her father and the space jade pendant~

Jiang Zhiying said that this is not a problem. With space and abilities in hand, she can roam freely.

and many more! How did the mortal enemy pass through!

Jiang Zhiying decided to attack first, who would have known that the eyes of her nemesis were getting more and more wrong!

PS: 1V1 Shuangjie sweet pet, the male and female protagonists are big brothers.

- Description from novelbuddy