DxD: Scion of Lucifuge - Chapter 6: Pink Twintails Saya Takagi!

I woke up in my sleep, and a strange door appeared in my home…Behind every door is a strange world.

In the nightmare world, Jiang Cheng added the news from the strong man to the fat man, and he almost cried when he heard the latter, “If you die here, the whole family will stand upside down and bleed?”

“Is such that.”

“Then I don’t think you are too scared?” The fat man widened his eyes.

Jiang Cheng turned his head and said in a very formal tone: “Because I am an orphan.”

- Description from novelbuddy

A biker tries to save a cat on the highway and gets hit by a truck (Truck-Kun), he was rushed to the hospital but, due to internal bleeding, he dies only to be reborn as a cat, in a new world with a system.

In this new and vast world, he tries his best to get used to his new body and get stronger along the way. With his overpowered system and skills. To one day become untouchable.

Polygamy is abolished.

We don’t have to force ourselves to live together anymore…

Chen Qiu had transmigrated to an Immortal World, where in this world of immortals— there were Heavenly Dao Decrees, a panel-like “Heavenly Pride Leaderboard,” and numerous entries. ... Every cultivator, upon breaking through a Great Realm, could obtain an entry. Different entries combined to define the cultivator’s limits and directions for development. Some cultivators relied on the entry combination of “Nine Ox Power” + “Hundred Percent Accuracy” + “Ignore Barrier” to marry into the Dragon Clan and became the greatest Beast Master in history. Others relied on the entry combination of “Nonsensical Babble” + “Deceive the Junior, Fool the Senior” + “Martyr’s Command,” becoming the greatest State Preceptor in history. Meanwhile, Chen Qiu’s first entry, “Rise Through the Ranks,” allowed him to choose one out of three random entries each time he broke through a small realm. From then on... Various entry fusion techniques, astonishing the human world! ... When everyone in this world had a golden finger, it all came down to whose destiny was tougher!