The Neo Saitama of the future is a sprawling urban landscape constantly flooded by neon light. And in its shadows lurks a vast criminal world with all sorts of shady characters. Among them are the deadliest force known to humanity... NINJAS!

"Power hungry, white collar workers take to the abandoned wastes of Neo Saitama to hunt bio-engineered lifeforms in "Kill-Zone Sumo Wrestler." The duo were not aware that this old complex is also the home to a ninja! In "Last Girl Standing," Koko Yamoto discovers that she is a she-ninja after witnessing a tragic event. Now she must control her previously suppressed power, while protecting herself and her friends from the violence that lurks over most of Neo Saitama."—Page 4 of cover.

"The Soukai Syndicate's resources seem to have no limits. Known for their scores of yakuza clones, they also have a number of ninja across Neo Saitama to handle their dirty business. Recently the cartel has been busy recruiting new talent to join their ranks. Two high school youths are in their sights—one an afro-wearing street punk with a death wish and the other a high school girl and former competitive origami champion"—Page 4 of cover.

"Recently rumors have been swirling all across Neo Saitama of Ninja Slayer's death. But deep within the darkest crevices of the underworld there is word of another ninja hunter! Is the masked man a ninja? Is he a renegade yakuza? Or could he be a cyborg developed by the NSPD? No one really knows who the man behind the Tengus nose really is...or his purpose."—Page 4 of cover.

Originally published in Japanese as: Ninja sureiyaa, by Kadokawa.

Giddy Up! After Ninja Slayer, with the aid of Nancy Lee, takes down the cyber-ninja Daedelus, he reappears deep in the badlands outside of Kyoto with a Vietnam vet ninja and a zombie ninja in this manga homage to The Good, The Bad and The Ugly.

Darkninja vs Ninja Slayer After vanquishing an extraordinary ninja in the Kyoto Badlands, readers are flashed back to the conclusion of the Dragon Gensodo Arc. With an antidote procured, Ninja Slayer now must overcome an even more powerful force looking to destroy him and his Dragon Dojo.

マルノウチ・スゴイタカイビルの悲劇から1年……犠牲になった妻子の仇を討つため、ネオサイタマの聖夜にニンジャスレイヤーが跋扈する！　【メリー・クリスマス・ネオサイタマ】を収録！

ネオサイタマを牛耳る「ソウカイヤ」を壊滅させたニンジャスレイヤーは、次なる標的ニンジャ組織「ザイバツ」の本拠地、キョート行きのシンカンセンに乗り込む。だがその車中にはザイバツ・ニンジャの影が……！

ニンジャとカラテと、男と女――。 キョート行きのシンカンセン車中にて、ザイバツ・ニンジャたちとの集団戦闘はクライマックス! ゾンビーニンジャ・ジェノサイドとゲイシャ・ユリコの終着駅は、果たしてジゴクか――!