Isekai Adventure in the Dimensional Cube - Chapter 52 - 0 Just let us take a quick look.

One day, when a novelist woke up from a restless sleep,he realized that he had transformed into his 12-year-old self.

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

An invasion like no other.
Dragons destroying everything in sight.
A new world rising from the ashes.

Blake lived through it all before he died, but now he was back, back to the time before things had ever happened.

A strange place with a strange girl....

Blake had no idea how it happened, but he suddenly had one of the enemies of mankind, a dragon girl, as his girlfriend.

--Extra Info--
Yuri tag is for his wives. Everyone in the harem will love each other.

Extra tag: NO NTR

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Ham Dani, a normal student whose hobbies were to read novels.