Tsuki ga Michibiku Isekai Douchuu - Chapter 19: Revenge on Kaku-san

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

When Isaac opens his eyes, he finds neither eternal rest nor peaceful reincarnation... but a descent into hell. He wakes up in a world identical to his own, except for one terrifying detail: portals filled with monsters are popping up everywhere, and if no one stops them within three days, the apocalypse is upon us. Here, only enlightened hunters - graded from F to SS - have the power to confront these nightmarish creatures. The problem? Isaac is an F-rank, an orphan with no future, condemned to survive in the shadows of the strongest.But one night, everything changes. His spirit is torn from this world and plunged into another, a veritable hell where humanity is no more than a herd of slaves under the yoke of dragons. Tortured and broken, Isaac soon understands one thing: this other world isn't just a nightmare... it's a warning.As he fights for his life, a miracle occurs: an enigmatic system enables him to steal the power of the monsters he slays.[*Ding* Would you like to absorb the physical stats?]Weak yesterday, predator today, he has but one goal: to unravel the mysteries of both realities and crush those who would see him fail.With a katana in hand and a secret burning in his soul, Isaac refuses to be a victim. If he wants to survive, he has only one option: become the ultimate hunter... before history repeats itself.

My name is Zhang Yanhang. I am an ordinary awakened person and a part-time college student. I live a monotonous life at three o’clock and one line every day. I go to school, practice, and go home. I neither smoke nor drink. My only hobby is to pause in time. Observe humans at the time.

I thought this boring life would last forever, but when I was lying in bed and preparing to go to bed that night, I accidentally ran into some interesting things.

[Whether to enter the world of ashes? 】

[Option 1: Yes (Successfully enter the world of ashes and gain the ability to digitize the body and the channels to become stronger. The price is that you may be late for school tomorrow because of staying up late.)]

[Option 2: No (Refusing to enter the world of ashes but feeling a bit wasteful to sleep right away, so I started playing games all night and practicing by the way, at the cost of being late for school tomorrow because of staying up late.)]

[Option 3: Ignore for the time being (It is recommended for patients with difficult diseases to choose this option. After that, you who have been suffering from sleepless nights and entangled whether to enter the ashes world will go to sleep at two in the morning. The price is that you may be late for school tomorrow because of staying up late. )】

ps: The protagonist is not the Virgin, kills decisively, the brain circuit is different from ordinary people, don’t like it if you don’t like it.

- Description from novelbuddy