A Hentai System in the World of Danmachi - Chapter 253 - 252 - I’ll take Haruhime with me.

[WARNING: R-18 | Explicit content, graphic violence, and adult scenes]In a vast and dangerous world devastated by the Four Great Ancient Mysteries, who can survive without shattering into pieces? Who would be unlucky enough to face chaos itself?Mitsuki Kirishima is the greatest gamer in history—the absolute best of them all. Behind the screen he is arrogant and sarcastic, a full-fledged hikikomori. In real life, however, he has two small problems. One of them is his appearance: no matter what he does, he looks like a pale girl with dark circles under his eyes!One night he received a strange email. Thinking it was something serious, he ended up accepting a promotion for a mysterious video game called “Crimson Souls.” Big mistake. When he went to sleep that night, he felt something strange. And when he opened his eyes… he was somewhere completely unfamiliar!But that wasn’t even the strangest part—there was a system tattooed on his arm.Now, armed with what seem to be trash-tier abilities, he ventures into the castle of an ancient kingdom long devastated by the Ash. There, he will discover his fate under the title of “King of the Void,” along with potential companions who are completely out of their minds.Ah… and the final problem is that his social skills are practically nonexistent.What will happen to this weak gamer in this new world?NO YURI / NO YAOI / NO NTR

This novel is also known as Deep Ocean Survival: A Submarine From The Start

The whole people traveled through, and everyone was trapped in the ocean abyss two thousand meters below the alien ice layer!

There is only one basic pioneer ship at the start!

Food, oxygen, water pressure…
Unpredictable seabed turbulence…
The powerful and terrifying Abyss Siren…
Evil and mysterious parasitic flora…

With all kinds of potential threats that follow everywhere, this road to survival is doomed to be extremely difficult!

However, when everyone was desperate for the hardships of survival, Meng Lei was calm and composed.

Because he found that he could actually see the system prompt!

“At a distance of 500 meters, a shipwreck of an alien pioneer was found, and the supplies inside are enough to make you rich!”

“At a distance of 1200 meters, I found a doomsday worm, rush up and kill it, and you will become the brightest cub wandering in the dark abyss!”

“The distance is 4,500 meters, and the ruins of an alien civilization are found. The danger level is SSS! Why are you standing still, turn around and run!”

- Description from novelbuddy

Sergeant Xia Yao, born into a wealthy and renown ancestry, is a playboy who has turned over a new leaf. Yuan Zong is an ex soldier from the special forces who opened a bodyguard training company after being discharged.

When Yuan Ru, Yuan Zong’s sister fell for Xia Yao’s charms, but could not break down his erected barriers, she came to Yuan Zong for assistance. Little did she know, the moment Yuan Zong saw Xia Yao, this ex-special force knew no other person would ever catch his eye.

And so begins the battle between brother and sister for the most coveted price – Xia Yao’s heart.

- Description from Novelupdates

Bai Yang is the youngest son of a rich family who grew up spoiled, unambitious and having no one expect anything from him. He doesn’t really mind this though, because he’s still able to live a simple and happy life.