After losing his parents, Kazama Ren was raised by his shinobi grandfather — a man whose idea of affection involved ambush training, treacherous movement drills, and poison consumption. By the time Ren reached high school, he’d mastered nearly every technique in their clan’s arsenal.

Too bad none of it mattered.

In the modern world, being a ninja didn’t pay the bills. The closest Ren got to using his skills was running a "ninja experience" business for tourists — barely scraping by, and completely unfulfilled.

But during a moment of existential crisis, he stumbled upon a mysterious portal to another world… on the brink of collapse?!

Now, Ren must navigate a realm teeming with deranged beasts, bloodthirsty monsters, and one ridiculously power-hungry villain. His only ally? A sometimes-helpful, kimono-wearing, floating duck with a pride bigger than itself.