Ninja Slayer

[Passiflora C]

A novel authored by two Americans, Bradley Bond and Philip Ninj@ Morzez, who don't exist; a western Ninja phenomena that never was; a novel with a translation whose original copy in its original language exists nowhere; a novel whose true authors some speculate to be Honda Yu, some speculate to be Sugi Laika, or perhaps both all at once; a novel with an anime adaptation; primogeniture of ninja, a novel that's complete; a novel illustrated by わらいなく
Ninja Never Dies.
That's what Ninja Slayer is.
Or what I think it is.
Or what it's said to be about.

And here would be the equally enigmatic synopsis for the first book of this epic:

Ninja Must Be Killed! Followers on Twitter Are Addicted!!"
The translated novel version of this hit book is now available in physical form as an e-book!

Fujikido Kenji, a salaryman whose wife and children were murdered in a ninja conflict. He was on the brink of death himself when a mysterious ninja soul possessed him. Spared from death, Fujikido becomes "Ninja Slayer" — a person who kills ninjas — and throws himself into a quest for revenge...!!
The "Ninja Slayer" story, which was originally a Twitter translation series by a team that obtained rights from the original author, is known for its intense linguistic style. The translation faithfully captures this style, earning it the nickname "Ninja Kill Language," and continues to create addicts!
Readers are hit with a shock of ninja reality through supernatural words like "Marunouchi Sugoi Takai Biru" (Marunouchi’s Amazing Tall Building), "Jissai Yasui" (Actually Cheap), "Wasshoi!", and "Kodaiji Rōma Karate" — bizarre terms that evoke a sense of otherworldly ninja reality!
The fire that started on Twitter is now blazing into real flames. Run, Ninja Slayer, run!

Really, that's what it says.
https://bookwalker.jp/series/10904/list/

Ninja out.