Kenji Fujikido is a salaryman whose wife and child were killed in a ninja turf war. In a brush with his own death, Fujikido is possessed by an enigmatic ninja soul known as Naraku Ninja. Fujikido cheats death and becomes "Ninja Slayer" -a Grim Reaper destined to kill evil ninja, committed to a personal war of vengeance. Set in the dystopian underworld of Neo-Saitama, Ninja Slayer takes on Soukai Syndicate ninja in mortal combat.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Born in Red Black | 2015-04-16 | 15 min |
| Season 1 | Episode 2 | Machine of Vengeance | 2015-04-23 | 15 min |
| Season 1 | Episode 3 | Last Girl Standing, Part 1 | 2015-04-30 | 15 min |
| Season 1 | Episode 4 | Last Girl Standing, Part 2 | 2015-05-07 | 15 min |
| Season 1 | Episode 5 | Rage Against Tofu | 2015-05-14 | 15 min |
| Season 1 | Episode 6 | Surprised Dojo | 2015-05-21 | 15 min |
| Season 1 | Episode 7 | Bane of Serpent / Zazen and Ninja | 2015-05-28 | 15 min |
| Season 1 | Episode 8 | Apocalypse Inside Tainted Soil | 2015-06-04 | 15 min |
| Season 1 | Episode 9 | One Minute Before the Tanuki, Part 1 | 2015-06-11 | 15 min |
| Season 1 | Episode 10 | One Minute Before the Tanuki, Part 2 | 2015-06-18 | 15 min |
| Season 1 | Episode 11 | Menace of Dark Ninja | 2015-06-25 | 15 min |
| Season 1 | Episode 12 | Day of the Lobster / Day of the Lobster 2 | 2015-07-02 | 15 min |
| Season 1 | Episode 13 | Swan Song Sung by a Faded Crow, Part 1 | 2015-07-09 | 15 min |
| Season 1 | Episode 14 | Swan Song Sung by a Faded Crow, Part 2 | 2015-07-16 | 15 min |
| Season 1 | Episode 15 | Sushi Night at the Barricade | 2015-07-23 | 15 min |
| Season 1 | Episode 16 | At the Treasonersvill | 2015-07-30 | 15 min |
| Season 1 | Episode 17 | Treasure Every Meeting | 2015-08-06 | 15 min |
| Season 1 | Episode 18 | Ever Felt Cheated? | 2015-08-13 | 15 min |
| Season 1 | Episode 19 | Stranger Stranger Than Fiction, Part 1 | 2015-08-20 | 15 min |
| Season 1 | Episode 20 | Stranger Stranger Than Fiction, Part 2 | 2015-08-27 | 15 min |
| Season 1 | Episode 21 | Neo-Saitama in Flames, Part 1: Like a Bloodarrow Straight | 2015-09-03 | 15 min |
| Season 1 | Episode 22 | Neo-Saitama in Flames, Part 2: Darkninja Returns | 2015-09-10 | 15 min |
| Season 1 | Episode 23 | Neo-Saitama in Flames, Part 3: And You Will Know Him by the Trail of Ninja | 2015-09-17 | 15 min |
| Season 1 | Episode 24 | Neo-Saitama in Flames, Part 4: Dark Dusk, Darker Dawn, Part 1 | 2015-09-24 | 15 min |
| Season 1 | Episode 25 | The Best of Ninja Slayer from Animation | 2015-10-01 | 15 min |
| Season 1 | Episode 26 | Neo-Saitama in Flames, Part 5: Dark Dusk, Darker Dawn, Part 2 | 2015-10-08 | 15 min |
