MTL - Black Clover: Runaway Asta - Chapter 31

In a land where no magic is present. A land where the strong make the rules and the weak have to obey. A land filled with alluring treasures and beauty, yet also filled with unforeseen danger. Three years ago, Xiao Yan, who had shown talents none had seen in decades, suddenly lost everything. His powers, his reputation, and his promise to his mother. What sorcery has caused him to lose all of his powers? And why has his fiancee suddenly shown up?

Once upon a time, there was an office worker who was dragged by his boss to take a hot spring bath. While he was soaking…

This is probably very serious. He came to a Beast world and was licked out of his sleep by a golden lion. The lion accompanied him. Only then did he understood this world… when he came to the lion’s tribe, he found that this was really not an experimental base…

- Description from Novelupdates

Mo Zhu’s mother remarried after her father went missing, and she had lived in the countryside with her elderly grandmother ever since. The girl who had no parents wanted to protect herself. Therefore, to avoid getting bullied, she had turned wild since she was a child—she played truant, fought, and drank. There was nothing she did not know how to do. She was a problematic student in the eyes of her teachers, a big sister in the eyes of her classmates, and a hooligan in the eyes of her acquaintances.

Seven years ago, after their breakup, he disappeared without a trace.