Sentai Dai Shikkaku (戦隊大失格, literally "Sentai Disqualification") is a manga series by Haruba Negi, serialized in Weekly Shōnen Magazine from February 2021.
Thirteen years ago, the immortal Evil Army Kaijin attempted an Alien Invasion on Earth, only to be shortly thwarted by the Ryujinnote Sentai Dragon Keeper and their Divine Weapons within a year. All of their commanders were eradicated, and their mooks, the Dusters, were eventually forced into a ceasefire agreement: The Keepers would stage weekly live battles on Sundays, where the Dusters are forced to be their butt monkeys and purposely lose to them every week in exchange for their lives being spared. Thirteen years of this have passed, and one Duster, D, decided he's had enough of this farce. Using a Human Disguise, he plots to eliminate the Keepers from the inside through enlisting in their recruitment programme, but soon learns that he isn't the only person with the same plan in mind, and realises he may have gotten way too in over his head.
Sentai Dai Shikkaku provides examples of:
- Actually, I Am Him: Chapter 2 has D seeking out Red Keeper amongst a group of his apprentices. One of them, Shun Tokita, declares himself as the Keeper, only for Yumeko to promtly out him as just a third-rate apprentice (even though Shun insists it's only a matter of time).
- All Part of the Show: Inverted. The public and most of the Rangers are convinced the weekly confrontation with the Kaijins is an actual Blood Sport, but in actuality it's a Staged Shooting Propaganda Machine made to glorify the Dragon Keepers as the heroes of Earth. To the public, it seems the Kaijins permanently chained their ship to Earth and haven't given up on their invasion for thirteen years, but in reality it was the Keepers who chained it down to prevent the Dusters from going home in order to keep up the farce. D theorises that the only people who know the truth are only just between the remaining Dusters and the Keepers themselves.
- Blessed with Suck: Despite having immortality, the Dusters' bodies are highly fragile, and they can experience pain from damage. Even as shapeshifters, any disguise they don, human or Monster of the Week, can be shattered easily with the right amount of force.
- Chance Meeting Between Antagonists: in chapter 2, just as D discovers Red Keeper's identity through a poster next to an elevator, Sosei Akabane/Red Keeper himself comes out of the elevator and passes by him.
- Corporate-Sponsored Superhero: The Dragon Keepers clearly show that they aren't true superheroes due to them indulging in the profits of their actions. From merchandising to a Sentai military training program and even creating their own T.V. show, they are getting rich and famous from their needlessly cruel actions towards the Dusters.
- Dark Parody: In a similar fashion to The Boys (2019), this manga plays on Sentai superhero genre tropes to the extreme. The villains had already lost and they lay at the mercy of the heroes. Now the villains are forced to continue playing their roles by the heroes in fear of the dangerously powerful weapons the heroes used against them. One day, a Duster named D decides that he's had enough of the Sentai and plots to take down the Sentai one by one with the help of a Ranger Cadet named Yumeko.
- Decoy Protagonist: Early promotional materials indicate the main characters to be the Dragon Keepers themselves, however the plot actually follows Villain Protagonist Mook D, as he sets off on his own plan to infiltrate and defeat the Dragon Keepers from within their ranks.
- Disproportionate Retribution:
- For having attempted (and failed) an Alien Invasion on Earth, the Dustards were forced to become the Keepers' permanent butt monkeys, with their ship permanently chained to Earth and not allowed to return to their home planet.
- Mook F was mercilessly killed by Red Keeper for coming down to Earth on a non-Sunday. The problem is the poor guy wasn't even causing any harm in the first place, but was just looking for D, who hasn't came home in days.
- Early-Bird Cameo: Chapter 2 starts off featuring a group of five supposed Ranger superiors monitoring a recruitment test D is involved in. Given that one of them is later on revealed to be Sosei Akabane/Red Keeper, it's safe to say his four other colleagues next to him are actually the rest of the Dragon Keepers.
- Fantastic Recruitment Drive: The Rangers, an organization that recruits and trains many young cadets to mainly support and, if needed, succeed the Keepers' mantle should the time comes. They are mostly relegated to ordinary field work such as being security guards for the live battles or assisting the police.
- Immoral Reality Show: Thirteen years of Sunday battles have led the entire public to treat it as a Blood Sport, constantly looking forward to the Keeper's slaughtering of the Monster of the Week every week while heavily jeering at the Dusters.
- The Mole: D's main plan was to be one within the Rangers in order to get close enough to the Keepers to eliminate them. Yumeko reveals herself to D at the end of chapter 2 to be one against the Keepers as well, but for a different reason.
- Mook Promotion: Played with. The Dusters are forced to come up with a Monster of the Week every week, which whoever is on duty transforms into and replicates the appropriate abilities to fight with. Due to their immortality (and the fact that the Divine Weapons used on stage aren't the real ones) however, once defeated they revert back to being a normal mook and retreat to their fortress to recover, letting another mook take the next shift the following week. This was how they were able to keep this up for thirteen years.
- No Name Given: D's default human form never had its name revealed. One would think he would have had used a human name to register with the Rangers, but his result slip did not state his name and was instead signed off by Hibiki, due to the latter being assigned as his mentor. Characters that know his true identity also explicitly refer to him as "Mook/Footsoldier" rather than using any name he provided for his disguise.
- One-Letter Name: The Dusters are all each named "A" to "Z". This also heavily implies they only have 26 men within their ranks.
- The Power of Friendship: Subverted. In the fight of D against Hekiru, Hekiru makes a grand speech about how it is the power of his bonds with others and their support that makes him strong enough to fight D in typical shounen fashion, but because D is an alien, the concepts he keeps spouting are totally foreign to him and he doesn't understand or care about them, but he points out that it is not his feelings or convictions that are beating D, it's the fact he has a weapon that was tailor-made to kill those like him. Hekiru takes him up on this challenge and drops his weapon promising that the feelings others have for him will work even if they were to fight bare-fisted, but D sends him flying with a single punch, at which point he changes his tune to say that the feelings of his friends are imbued in his weapon instead.
- Staged Shooting: The weekly Sunday battles. The "Divine Weapons" the Keepers use there are non-lethal substitutes that purposely (and painfully) spare the Dusters from death, so as to continue using them for the next show. Hibiki notices the real Divine Weapon used by Red Keeper to execute Mook F as punishment looked drastically different from the mechanical-looking ones used in the show and marketed as toys.
- Too Dumb to Live:
- The Dusters are expected to keep up the ruse that their entire organisation and superiors still exist, despite being just mooks and the only sole survivors of it. This results in them having severe difficulty coming up with plans and monster designs as their superiors were the ones handling it all before, to the point the Rangers had to provide them reference books and scripts to try to give them some ideas.
- A concerned Mook F came down to Earth looking for D without donning a Human Disguise just like the latter didnote . The public unrest he caused walking around soon caught the attention of Red Keeper, who executes him for breaking the "No wandering on Earth during a non-Sunday" rule.
- D himself, despite being shown to be smarter than the average Duster, is very prone to giving in to his reckless impulses, and is terrible at acting despite having human disguises as his speciality. It ultimately gets him almost Killed Off for Real in Chapter 5 by Blue Keeper for attempting to confront the Keepers instead of running away after they found him stealing Red Keeper's Divine Weapon.
- Villain with Good Publicity: Through the Dusters perspective, the Dragon Keepers are the truly villainous people who gain respect of the public by taking advantage of their weakness and forcing the Dusters to continue playing their roles as the "villains" of the Dragon Keeper show.
- Weaksauce Weakness: The Divine Weapons, obtained and developed by the humans within a year into the invasion, are the only items capable of permanently killing the Kaijins. It allowed the Keepers to swiftly execute the Kaijin executives, while the remaining Dusters live in fear of being executed by them.