MTL - Kill That Villain! - Chapter 85 poisoner

Banaza was summoned to The Magical Kingdom of Kryrode as a Hero Candidate, however, due to having only the abilities of a regular citizen, he was treated as a disqualified Hero. He, who was originally supposed to be returned to his original world, became unable to return, due to the Magical Kingdom’s mistake, and, inevitably, had to live in this world. However, the moment he became Lv2, Banaza acquired every attainable skill and magical ability, and he became a Super-Cheat with Stats that transcend normal limits! Even so, Banaza , who does things at his own pace with an easygoing smile, takes Lys of the Demon race as his wife, and fully enjoys his newlywed life. He then changes his name to Furio and leads an even more laid-back life! However, chaos is in store for the Furio household; on top of a strange pet and four, freeloading Female-Knights, even a Devil and Former Demon King join in. Despite his circumstances, even with his life becoming increasingly chaotic, Banaza continues to enjoy his laid-back lifestyle. Please enjoy the story of the everyday life of the Furio family, which, with the birth of the twins, gets ever increasingly laid-back. Included is also the story of the man who became a Hero in Banaza’s place!

By the time I reached thirty, I hadn't managed to provide any of the happiness I wanted for my wife.I also still couldn't become the support my parents relied on.At this turning point in my fate, my income suddenly began to increase randomly.(A daily life tale in a wealthy family setting, featuring a single female lead and no harem.)

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- 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.