Esper Harem in the Apocalypse - Chapter 24 - Reasons To Go Harem Route

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

Lucien, a guy who has nothing but the desire to save his mother. To get strong enough, he makes a contract with the demon of L.u.s.t. And now, only by making a great harem, will he gain the power to protect those dear to him.

Have you ever considered, what is a Limit? Well, I have. I’ve seen people who were as strong, as wild animals. Those that were faster than the wind. Some that shined with intellect. Yet, what are the Limits of mankind’s strength, or intelligence?

No one seems to know. We develop more and more, seemingly without an end. What if, someone was the smartest in the world? Would that suggest the Limit? What if, someone was the strongest in the world? Would that be the Limit? Would that make that someone, more than a Human? These are just questions, but what if I saw people reach their Limits? What if I know what happens, when you break the Limits? What if I were to tell you about it, would you believe me?
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An Individual from Earth finds themselves in the Shinobi World, equipped with a Scientific System. From that moment, he delved into scientific research far ahead of its time.