When the Machine Empire Baranoia begins an assault on Earth, United Airforce commander Gorou Hoshino takes matters in his own hands to fight back against them and save his four new teammates as OhRed.
The four new Ohranger learn from Gorou and Commander Miura about the power they are now entrusted with as Baranoia sends down a giant to continue their rampage of Tokyo.
Acha infects a police officer with a parasite from a Machine Beast, mutating him into a "human Machine Beast" that threatens the populace, including his own son.
A genius Machine Beast manipulates an incident from Miura's past in hopes of using it to find out intelligence on the new machines being built for the Ohranger.
In order to save both Miura and the city from the combined assault of Bara Brain and Bara Separate, the Ohranger must complete their new secret weapon on their own without their commander's assistance.
In order to deal with the threat of Ohranger Robo, Bacchus Wrath brings in a powerful Machine Beast and upgrades Acha and Kocha to be able to create a greater challenge to the U.A.O.H. forces.
When a Machine Beast infects the male Ohranger with a deadly rusting malady, Juri decides to join with Baranoia in order to save herself, even against Momo's pleas.
When Hysteria sends down a Machine Beast to make humanity fall in love with appliances, Shouhei must figure out how to stop it before they enact their true plan.
When Momo is stranded while trying to stop a Machine Beast trying to reawaken Mt. Fuji's volcano, she is rescued by a mysterious dog protecting the mountain.
The musical abilities of a Machine Beast accidentally brings a 23rd Century boy to the present, forcing Shouhei to protect him while trying to figure out how to send him back home.
When Bacchus Wrath's newest Machine Beast easily overwhelms Ohranger Robo, Gorou discovers an earlier U.A.O.H. mecha that previously killed its former pilot.
Buldont develops a boxing Machine Beast to steal Shouhei's ultimate move in order to defeat Red Puncher, forcing Gorou to work to develop the means to stop his friend's stolen attack.
In order to discover the means to combine Ohranger Robo and Red Puncher into a new formation, Gorou must track down a boy who took a particular memory chip needed to finish the combination.
When the hero who defeated Baranoia in the past returns to Earth in present times, the Ohranger must find and protect him as Bacchus Wrath sends a Machine Beast tamer to deal with him.
Riki reveals his true potential to Baranoia and the Ohranger in order to protect Dorin, merely setting him up to be captured by Keris as part of Bacchus Wrath's revenge plot.
Unsure of the fate of Riki after his capture and believing Keris' Bara King may be him, the Ohranger prepare to fight it despite Dorin claiming that it may not be.
Juri investigates a strange cram school secretly controlled by Acha where students get perfect test scores at the cost of being controlled by a Machine Beast.
Momo becomes haunted by nightmares of a friend who disappeared eleven years prior, forcing her to discover what happened to her and the culprit behind this.
When Bacchus Wrath begins upgrading his giant Machine Beasts to make them unstoppable, the Ohranger partake in a risky move with Miura's assistance in order to infiltrate and take down his new war potential.
When Bacchus Wrath emerges with his ultimate plan to crush the Ohranger, the team must learn to unite and transcend their hearts in order to master the ability to defeat the Baranoia leader.
Bomber the Great, an exiled Baranoia traitor, arrives to take over the machine empire's abandoned leadership, causing chaos for both the royalty as well as the Ohranger.
Gunmajin continues to cause trouble for the Ohranger as both Bomber the Great and Buldont aim to use the wish-granting majin for their own selfish desires.
Bomber the Great makes his move to overthrow Hysteria and Buldont and become Baranoia emperor, starting his reign with a scheme to use humanity's greed against itself.
As the Ohranger try to save Shouhei and the victims of Bomber the Great's gold strategy, Hysteria and the final remains of Bacchus Wrath begin the preparations for the ascent of Baranoia's future.
Buldont and Multiwa take their places as the new leaders of Baranoia, crushing Bomber the Great while forcing him to be used in the most humiliating way possible for Earth's destruction.
Dorin decides to release a forbidden ancient power in order to save the Ohranger when they become captured for Buldont's public execution, putting both herself and Riki at risk.
When Multiwa decides to use her beauty to lure the male Ohranger to help her, Momo decides to become Gunmajin's master in order to have him assist the team.
Kaiser Buldont uses a machine-controlling Machine Beast to begin a final all-out assault of Earth, forcing the Ohranger into the beginning of their ultimate showdown.
With Baranoia's destruction and the capture of their teammates wearing them down, the Ohranger try to figure how to deal with the invasion as their battle to save their world becomes burdened by another sacrifice.
After taking a detour to discover how to bring back their Super-Power, the Ohranger return to Earth 6 months later and completely conquered by Baranoia.
With their Super-Power restored, the Ohranger confront Buldont and Multiwa in order to save the Earth from Baranoia, though face one final task that could determine the future.
