Permanent Martial Arts - Chapter 1912 - : The Black River, It’s Indeed a Black River!

On his usual way to home Mikado Tsuchio fell into a hole that suddenly opened on the ground. Just like that, Tsuchio falls in a different world, he lands on a Grappler Wyvern and manages to tame it.

Tsuchio decides just like that to live in the other world, the reason for his quick decision: he wants to make a monster girl harem.

“Reality is stranger than fiction”—There is this saying, I don't know who said it, but it certainly holds true for a certain unlucky man.

In a futuristic apocalyptic world, where Earth is ravaged by natural disasters and cataclysms, it feels like the world is on the brink of doom.

However, amidst the chaos, humanity still persists.

Yet, everything seems to be spiraling downhill.

In this apocalypse-ridden world, Noah, who is suffering from a rare blood disease, wonders if he will ever survive.

Fortunately, his grandfather-a brilliant scientist, discovers the cure! Nano machines!

Finally, Noah can reclaim a normal life... but alas, fate has other plans in store for him.

After one unfortunate cataclysmic event, when Noah opens his eyes, he finds himself in an entirely different world—only to realize that he has fallen inside the very novel he wrote as a kid.

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Following a brutal and tortured death, a former assassin, known only by his codename Kuro, is given the opportunity to reincarnate in another world, a world with magic and monsters. Armed with an unrivaled healing factor and an inhumane pain threshold, Kuro opts to go for a reckless direct approach in this world instead of a stealthy and cautious one, and as a result, slowly gains attention bit by bit.

Having previously been a loner in his old life, he interacts and befriends people for the first time in his existence, however, his blunt nature also sees him making just as many enemies, both big and small. By combining his old assassin skills with the magic powers of this world, along with his high resistance to pain and rapid regeneration, he doesn't take long to establish himself as a formidable force in this world.

Initially, Kuro only faces minor threats, like weaker monsters and bandits. But before too long, the threats slowly but surely become more and more severe…from Zombies to a bloodthirsty empire to Vampires and Demons, and even divine beings…however, as the enemies he faces grow stronger, so does Kuro, gaining rare powers that have never or rarely ever been seen in this world…