The Main Characters That Only I Know - Chapter 26:

Kanzaki Ryoma transmigrated into the world of Tokyo Ghoul and began fusing with Uchiha Madara. Determined to bring an end to this twisted world, he chose to implement the “Eye of the Moon Plan” and ultimately activated the Infinite Tsukuyomi!

When the Terminally Ill Noble Allenbert woke up from his fever, he realized that he was the reincarnation of Karzan, the mad dog who roamed the underworld.…But something about this place doesn’t feel right.“Allenbert, nobles need secrets and darkness.”The sinister and chilling schemes of his brother, like a snake, are suffocating him from all sides.“You’ve been causing quite a stir lately.”The powerful and authoritative eyes and ears of the head of the family are hidden everywhere, watching him.“…When will I see Mother?”Meeting his mother, who has secluded herself due to a mental illness, seems impossible.“But it’s okay.”Karzan failed, but Allenbert’s journey is just beginning.“Two lives, two revenges.”There’s no mercy.I’ll pay back with interest, and make sure it’s done properly.

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

The Pseudo-Holy Grail War of Snowfield is About to Begin!Moran, who has transmigrated into the Type-Moon universe, is determined to clear the game in one life!Waiting online, urgent!Ding! You have successfully activated the Life Simulator!• 【You drove out the foreign Olympian Machine Gods, took the hand of the Earth Mother Goddess, and founded a new nation and mythology.】• 【You are the Lord of the Millennium Castle, bestowed with the name Brunestud, and the beloved ruler of the land in the eyes of the Crimson Moon.】• 【You are the Final King of the Age of Gods, single-handedly preventing its decline and ensuring that Divine Age Britain endures to this day.】Behind this dazzling simulated life, Moran now faces—Arcueid: “Weren’t you supposed to pick me up at the Millennium Castle? Why are you here in the Holy Grail War?!”Artoria: “Enough! Come back to Britain with me!”Ereshkigal: “Moran! Who are all these women?!”As his ever-growing circle of admirers closes in, Moran realizes—This might just be the hardest “Kidney Grail War” in history.