Re:Zero Kara Hajimeru Isekai Seikatsu - Chapter 54Arc 7, B - “Covering the Blue Sky”

Gu Yang crossed over to a high-martial world, eked out a living in small village for two years, and finally saved up enough and activated the Life Simulator system.

With a certain amount of money, a simulation can be run.

After the simulation ends, one of the three can be retained: realm, martial arts skills, or life wisdom.

[For five years you were an accountant, saved up enough money to buy a cultivation manual, practiced hard for ten years and became a Ninth Realm martial artist, but then ran into an enemy and died!]

[Once you left the mountains, you were at the Ninth Rank, became a protector of a certain family, practiced intensely for twenty years, broke through to the Eighth Grade, and ultimately, died of old age in a small town.]

[Once you left the mountains, you were at Eighth Grade, received recognition from a noble clan, were taught profound martial arts, but due to slow progress, were marginalized, and after a dozen years, you finally broke through to the seventh grade, but then encountered powerful foes on a mission and were killed.]

…

After countless rounds of simulations: [You encounter people, but none are a match for you. You realize that you have become invincible.]

……………………………………………………………

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The three-year marriage had been torturing her like shackles. Finally, she decided to break free from this cage, only to find that she was pregnant with triplets. When she was leaving, she had no choice but to leave her daughter, who was in critical condition due to premature birth, to her ex-husband, and then she flew far away with her two sons.Several years later, she returned to the country and wanted to secretly visit her daughter, but was discovered by her ex-husband!“Who are these two little boys?”“How do I know? Maybe they are your offspring.”The man gnashed his teeth and was about to snatch the sons away. She stopped him at once and said angrily, “Have you forgotten how you treated me before? How dare you take my sons by force?”He sneered and picked her up in his arms, saying, “Babe, my target is not them, but you!”

Dear comrades, masters, priests, masters, fairies, demons, and leaders, welcome to my world and enjoy the supreme pleasure and supreme enjoyment brought by traveling through various worlds (funny laugh).

- Description from novelbuddy

Talented in Magecraft but useless in physical combat?

Can summon 10,000 Servants but can he defend the rear by himself?

I will say just one line in reply:

“That will not be a problem!”

This is the tale of a young man who obtained an enshrined miracle.

“As long as I have my familiars, I am undefeatable!”

- Description from Novelupdates