MTL - Peak Strength - Chapter 13 Is she a little 3?

Three years ago, in the land of Reinbulk, a Legendary Hero was summoned in the Kindom of Leezalion and he succeeded in repelling the Demon King. Now, five students are summoned back into Reinbulk by the Kingdom of Luxeria to fight against the Demon King and the demon army. Unlike the other heroes, Yashiro Yuu has no magical affinity and the Luxeria Kingdom has no intention on acknowledging his existence or returning him to his world.

We’ve come to a world where the roles of men and women have been reversed. So, of course, women will rush to us. “You don’t have to bring water.” “Oh, okay…” …I guess I’ll just have to live the way I always have.

The Human Emperor and his opponents were embroiled in a 33 day long final battle involved the strongest experts. After destroying the Abyssal World and sealing the Abyssal demon king’s godly weapon‘ a mysterious purple card disappeared into the space-time vortex‘ and tunneled through infinite space-time.

In the vast wilderness‘ where martial arts was still slowly growing in its infancy‘ several peerless masters tried to find their path in the world of martial arts.

A young adult named Yi Yun from modern Earth had unwittingly stumbled into such a world and began that journey with a purple card of unknown origin.

It’s a magnificent yet unknown true martial art world. This is the story of a normal young adult turning into a legendary peerless expert.

- Description from novelupdates

This novel is also known as Long Live the Mad Wife!

Daughter of the Feng Family, born a waste. Forced to marry a fool in an attempt to expel evil influences. When the first killer from the 21st century possessed this body, the sky and the earth surged. She was indifferent and cold-hearted but she let her guard down around him alone. She thought he was a pleasant sheep but didn’t expect him to be a gray wolf in disguise!

- Description from Novelupdates