Sam was surfing with his cat when the world ended. Suddenly enlisted into a battle to fend off annihilation, Sam seizes the strength of the void to survive. In the aftermath, Sam is thrown into a new world shattered into floating islands with survivors from Earth. Training and fighting with his giant sword and apocalyptic mana alongside his magical healer cat, Sam's unusually quick to adapt to this deadly realm of monsters and magic. With endless threats to face and countless powers to attain, Sam's journey of ascension climbing has only just begun.

I was the most powerful healer in my world—the best, having devoted my entire life to mastering the art of healing. And yet, for whatever reason, my brother feared that I sought to claim his throne, and he marshaled his forces against me.

I used to be the greatest Earth Mage in my world. The head of the entire Order of Architects. But the older you get, the more you come to realize that at some point, you need to retire, so that you can have the chance to enjoy a peaceful life and to cede your place to the young, some of whom have already turned two thousand years old . . .So that's what I did. But I failed to account for one thing: during the course of my long life, I'd accumulated too many enemies, and they had decided to spoil my retirement. So they died along with me. And I hope their deaths were final. But mine was not!

I had lain down in my crypt to rest for a few decades, but when I awoke, centuries had passed. My castle is in ruins, my clan is gone, and necromancers are considered just a fairy tale for children. They take me for a healer. That's because the world is sick. And it's time for strong medicine.

Trevor Anderson is just another normal, overworked retail worker. All he wants is his promised promotion, a chance to use some of his vacation days without feeling guilty about it, and time for his hobbies. While waiting patiently for his life to improve, a workplace accident changes everything for Trevor, including the world he resides in. After he bungles his way through a summoner’s questionnaire and gains the Power of an extradimensional inventory, he lands in the peaceful town of Tosa.