Harry Potter: A Certain Ancient Rune Professor of Hogwarts (TL) - Chapter 103

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

Many years ago, a meteorite crashed into earth in New York city and this was the beginning of mankind's unprecedented evolution.

The year was 2030 and humanity had reached a stage that would not have been possible otherwise without this external factor but they weren't satisfied. In the selfish attempt for humanity to once again force their evolution, the search for immortality began.

A man named Dr. Schneider was the man responsible for this feat and he did achieve his goal but like the saying goes, be careful for what you wish for because that immortality came in the form of something perverse and twisted to nature.

It came in the form of zombies.

The world was in shambles or was it?

Jason, a 21 year-old shut in, he was at the bottom of the food ladder due to his life choices, disowned and alone, he was willing to waste the left his life gaming but even with this dedication, he wasn't that great a gamer.

But fate had something in store and that was in the form of a 'virus' transmitted through the gaming headset he had on and this would change Jason's life for either for better or for worse.

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Transmigrated to become a disciple of the demon sect, relying on the technique modifier to become a giant of the demon path.

[Detected the technique “Blood Nerve”, relying on devouring blood to cultivate]

[Side effect: easily affected by the spirit contained in the blood, becoming bloodthirsty, murderous, insane, and even brain dead]

[Please wait, system modification is in progress…]

[Ding! Modification completed and side effects canceled]

The main character is reborn as a character from a game he played in his previous life. This character falls into ruin along with the villainess, spending the last of their years together. A man named Kururi Helan.