Zenith of Sorcery - Chapter 18. Incursion

This is a story about the protagonist getting the system, going crazy in the biochemical apocalypse, producing aircraft and tanks, destroying zombies, saving good people and killing bad people.

- Description from novelbuddy

Ryouma Takuma, a 39 year-old man with a hidden past, finds himself in a strange white room. There the gods tell him that he has died and that they are sending his soul to a different world; a world where magic exists. After living alone for three years his gamer soul loses common sense and starts toward crazy routes.

Qiao Xuan, daughter of a county magistrate, supposedly had a fiance that everyone envied. But then her father’s legal wife schemed against her, and married her into a farmer’s family. On the night of her wedding, after seeing how shabby her room was, Qiao Xuan hung herself. When she opened her eyes again, a different Qiao Xuan had transmigrated onto this body.

The new Qiao Xuan stared at her husband and frowned after seeing how shabby the house looked. “Don’t worry. I know that you didn’t want to marry me, so I won’t touch you. I’ll apply for a divorce tomorrow and give you back your freedom.” But wait, Qiao Xuan hadn’t figured out what was going on yet! She couldn’t get a divorce, or else her father’s legal wife wouldn’t forgive her. Also, she was a woman of a different world and possessed special powers. Couldn’t she just build a business from here?

So it was decided. Qiao Xuan began assisting her husband and slapped the faces of all who wronged them. They kept leveling up, and went from being a poor farmer’s family to becoming the richest family in the area. Those who bullied her regretted their actions, and her husband had regrets too. “I never said I wanted to divorce you.” Qiao Xuan was perplexed when he was pressing her down on the bed. Why did he suddenly decide against getting a divorce?

The strongest Hero in history, Nakamoto Keisuke.

He was summoned to another world in the spring at the age of fifteen years old, and when he successfully defeated The Demon King, he was already thirty-two years old. He had finished his role in another world and returned to Japan, but the reality that had been waiting for him was, “Middle school graduate with seventeen years of blank period” label. He couldn’t find a decent job and had no choice but to spend his days working part-time.

Before such a Nakamoto, a beautiful girl who self-proclaimed had come to return the favor, appeared. “I’m the reward for Hero who had defeated Demon King”, said Angelica, a girl who came from another world that persistently tempted Nakamoto to make her his wife. Together with a high school girl who looks like Elsa, his beloved girl that he lost in another world, Nakamoto with his cheats skills got caught in a harem life.