City of Sin - Book 9, Chapter 22

Nagasawa crossed to Naruto Universe and was bound to Konohagakure.If Konoha is severely damaged and destroyed, Nagasawa’s lifespan will be reduced.He panicked at the thought of the upcoming Nine-Tailed Demon Fox's attack , and the thought of Konoha getting destroyed left him in despair.Fortunately, while bound to Konoha, he can obtain templates of powerful characters.At the beginning, He got the Whitebeard template! Since it's the Whitebeard from the Summit War of Marineford, he can use Tremor-Tremor Fruit's ability and Haki.Facing the Tailed Beast Ball, which terrorized Konoha Shinobi, Nagasawa leaped and shattered the Tailed Beast Ball with one punch!

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

A giant golden tortoise, as huge as the world, crosses a broken world.

Seeing the vast world in ruins, Xu Feng slammed the giant golden tortoise on the head.

“Be careful next time, don’t use such brutal methods.”

The story begins with a young turtle-raiser who wants to live a stable life in a small family.

- Description from novelbuddy

“The universe is vast and boundless; the Dao is unpredictable.”Lin Beichen was reborn into a parallel world, and a mysterious and profound voice echoed in his mind. Though he didn't have a system, he unexpectedly discovered his Heaven-Defying Comprehension and could perceive everything at a glance.“How should I utilize my Heaven-Defying Comprehension?”Until one rainy day. The deluge poured down, Electric Flash intertwined with Lei Ming, and Lin Beichen gazed out the window in a daze. In that moment, inspiration struck, and his heart resonated with a profound sensation.He slowly stretched out his hand, opened his palm, and looked toward the thunderous sky. He began to clasp one finger toward the heavens and the earth.“In this world, there was no Cultivation Method. But since I am here, one should naturally appear!”“Palm Thunder!”[ps: A unique protagonist-centered cultivation genre]