Kirigakure Gamer : Rise of the mist - Chapter 1: Student of the mist

[Mature Content]“The brightest light casts the darkest shadow”Eirin lived her life in the shadows of her precious friend, but she soon fell into deep chaos after she stumbled upon a humanoid that tried to take her life without an ounce of hesitation. She was saved by a group of people who wielded unknown abilities, and the moment she woke up, it all felt like a nightmare.Just when she thought she had escaped death, the people who saved her are now the ones after her life. Misfortunes started going her way, and creatures unknown to her appeared one by one, taking the most precious person away from her and leaving Eirin in despair.Secrets started unfolding, and the monster Eirin sought for so long was not the one she expected them to be.

Anyone who could construct a stable Spell Model could become a Wizard — that was the Wizards’ ultimate secret! Having been given a new life as the son of an aristocrat and armed with a super quantum computer from his past life, Spell Models came as easily as breathing to Merlin. With this overwhelmingly huge advantage, would Merlin become the greatest Grand Wizard of all time?

- Description from Novelupdates

In a world where kingdoms rise and fall, a seasoned player unexpectedly finds himself transmigrated into the very game he once mastered—Caldera. However, his new life as a ruler comes with a crushing twist: severe debuffs and harsh restrictions on his talents make survival nearly impossible. Against overwhelming odds, he fights tooth and nail to carve out a legacy. Despite his brilliance in strategy and marvels in combat, failure becomes his ultimate fate.