From Abyssal Invasion to Bursting Stars with a Single Sword - Chapter 21 - : Revenge Not Overnight, Take Action That Evening

Accompanied by all kinds of crisis and despair, was the arrival of mankind’s first significant superhero.

After dying prematurely from an incurable disease, Yuka Hikano finds himself in a mysterious realm filled with endless doors, each concealing divine gifts from powerful deities. He is not alone—others who have met the same fate of death stand beside him, unaware of the trials that await.They are put through various tests and eventually transmigrated into different worlds. But these worlds are nothing like the Earth they once knew.For Yuka, however, this apocalyptic world feels eerily familiar. It is a realm of endless war, devastation, and chaos—a world he once played in a game. Certainly not the kind of place one would wish to be reborn into.From infancy to adulthood, he must gather strength, knowledge, and allies to survive the horrors that lurk ahead. But when he awakens a system granting him a power beyond imagination, he soon realizes that blessings can also be curses.[You have gained Infinite Mana.]Infinite Mana...?What could possibly go wrong?

The story centers on Adam, a young man living a life of extreme hardship. Betrayed and cast out by his own family at a young age, he is forced to survive on the streets, working grueling, low-paying jobs just to make ends meet. His existence is a constant struggle against poverty and despair.Everything changes when Adam discovers a mysterious application on his smartphone. This app has a single, reality-altering function: every time he taps the screen, one dollar is instantly deposited into his bank account.At first, Adam uses the app to solve his immediate problems—buying food and securing a place to live. But as he taps his way from hundreds to thousands, and then to millions of dollars, his ambition and vision expand exponentially. He transitions from a destitute outcast to a global magnate, creating a business empire that astounds the world.People point in awe and say, “Look, that's Adam's mobile company,” as they admire the most high-tech smartphones on the market. They marvel at sleek, futuristic cars on the road, remarking, “That car is from Adam's company.” His influence even reaches for the stars, with observers noting, “That new rocket company? Adam started that too.”

It has been more than ten years since he was transported to another world. The protagonist Deris Fahrenheit, who has became a magician with special circumstances, was freely enjoying his life in this world. However, a girl appeared before him and asked him to make her his disciple. That girl seems to be a transported person――

It’s a story of him who becomes the girl’s teacher and trains her to achieve her revenge (?) in otherworld.