Toaru Majutsu no Index - Volume 20, War Report

Meet Sora and Shiro, a brother and sister who are loser shut-ins by normal standards. But these siblings don’t play by the rules of the “crappy game” that is average society. In the world of gaming, this genius pair reigns supreme, their invincible avatar so famous that it’s the stuff of urban legend. So when a young boy calling himself God summons the siblings to a fantastic alternate world where war is forbidden and all conflicts–even those involving national borders–are decided by the outcome of games, Sora and Shiro have pretty much hit the jackpot. But they soon learn that in this world, humanity, cornered and outnumbered by other species, survives within the confines of one city. Will Sora and Shiro, two failures at life, turn out to be the saviors of mankind? Let the games begin…

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

Nikol didn't think that his life would end on that day.

He was invited by his elder sister to go on a cruise vacation. Since it was a request from her he couldn't reject it.

During this vacation, Nikol fell from the boat and died protecting his sister from an attacker, at least that's what he thought but he felt something pulling him from the ocean giving him a nostalgic and warm feeling.

When he opened his eyes there was a figure, that he could easily identify but at the same time, she was quite different from what he remembered.

“My son, Welcome back”

It was the last thing, he heard before he lost consciousness again.

When Nikol opened his eyes again, he was amazed to see a dense forest around him filled with greenery.

At that time, he didn't know that this land was called Femdom Island for a reason.

Come and Join Nikol to find his fate, in this unknown land.