This Japanese Monogatari Isn't Lame - Chapter 8 - . Someone is Here (Please Collect!)

This is a story of an ordinary boy gaining unusual powers from his nightmares… It all started when Lin Sheng experienced something strange on what he thought was just another normal day. He begins to have recurring dreams that lead him on an incredible journey of discovery as he encounters spine-chilling monsters and elusive secrets.

- Description from Novelupdates

The ordinary 18-year-old Edo, during a nighttime walk, finds himself in a fantasy world where he gains a mysterious power that could shape his destiny.

The daughter of Prime Minister is a nympho?
The brutish Prince is her husband?
The stroppy Princess wants to kick her husband off the marriage sedan?!
“Shit! I want a divorce!”
“Why?!”
“You can’t satisfy me in bed!”
The next day, Prince Chen becomes the laughingstock of the whole Kingdom of Dayue.
How Hua Yueling, the Stroppy Princess with a soul from 21st century, will create her legendary story in this ancient world?

Regardless on how developed a society becomes, assassins and prostitutes will never cease to exist. There’s no need to think of the former as anything mysterious, and there’s no need to look down on the latter. They are simply doing their jobs.

When Tang En crossed over planes, he was forced into this murderous and hopeless profession.

“You have great talent for assassination.”

Tang En: “Huh, I have this kind of talent?”

“That’s right, your looks are exceedingly plain, this is very useful to assassins.”

“……” Tang En, “But I haven’t even managed to kill a chicken.”

“Irrelevant, assassins don’t need to kill chickens, only people.”

“……”

The story is about a plain college graduate crossing over worlds after dying in an awkward situation. Inheriting the game-like Assassin System and a badass butler from the transition, he now has to adapt to survive in this dangerous, new world. Set in a Western Fantasy Universe.

- Description from Novelupdates