The Simple Life of Killing Demons - Chapter 20Book 12:

“Are you my knight?” The silver-haired youth looked at the blonde girl before him and asked, his cheeks flushed red. This was their first encounter when he was only ten years of age.

“Are you my bride?” He held her in his arms, embraced the girl who had accompanied him for ten years straight. He was sixteen years of age.

“Are you my king?” He knelt before the throne, smiling foolishly as he looked at the girl holding the sword victoriously. At this moment, he looked like the boy he was when they first met.

“I’m fine without having eyes for you. The entirety of Camelot is for your taking.” Smiling soft and gently, he gave his eyes to the girl who lost her eyes due to the curse of the red dragon. He doesn’t regret it, he thinks. He was twenty years of age.

“So… Arthur… Artoria Pendragon, are you willing… are you willing to spend the rest of your life with me?” His voice was soft and clear as he reached out to touch her hand.

This was their legend.

- Description from Novelupdates

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.

Jiang Xun was transmigrated as a cannon fodder. Her mother died when she was young, her stepmother schemes against her, and her father abandoned her in a village. But Jiang Xun didn’t panic, and she was a person who always won by virtue.

Thieves would say, “Stop hitting me, I’ll change careers!”

Thugs would say, “Stop hitting me, I’ll return the money!”

At the Jiang family banquet, guests were watching her every move, waiting for her to make a fool of herself. “I heard that she’s been living in the village for eleven years and has a country bumpkin-like feel to her. If I were the Jiang family, I wouldn’t risk her embarrassing me by letting her attend.”

Mr. Jiang said to her, “Stay behind your mother and don’t speak lest you embarrass yourself.”

Her stepmother nodded. “The Qin family’s patriarch, Qin Mufeng is noble, benevolent, and abstinent. Don’t even think about someone like him; he’s completely out of your league.”

Sure. She didn’t intend to marry into a rich family anyway. She just wanted to beat up the man in the rumors. But why was this man following her around all day every day?

Qin An was a former senior grim reaper who retired after serving the underworld for thousands of years. Because of his outstanding service and had enough merits, he was given a chance to become a human and unexpectedly transmigrated to the Interstellar era. But, how can he live his retirement days when has no money and everything? So, Qin An entered a reality talent show for idols and became an existence that everyone admires to.