The warrior of light Eldran and his robot Raijin-Oh, get injured in a battle with the Jaku Empire from the 5th-dimensional world. They fall down into the 5th grade class at Hinobori School. On behalf of the damaged Eldran, the “Earth Defense Class” takes up protecting the Earth.
Eldran piloting the mecha Raijin-Oh crash lands into Hinobori's elementary school. With the last of his powers, Eldran saves the ones in the school at the moment: class 3 of the 5th grade. He entrust them with Raijin-Oh and the duties to protect the Earth, while Eldran goes into hibernation to recover his powers.
We Are the Earth Defense ClassE2 · 24 min
Class 5-3 gets a visit from the army, demanding to hand over Raijin-Oh. The arguing is interruped when Jaku Beast Dustoron is running loose in the city. After finding out that only Class 5-3 can operate Raijin-Oh, the army has no choice but leave Class 5-3 alone.
Tests Are a Huge Annoyance!?E3 · 24 min
The entire Class 5-3 average match score of the last test is far below the rest of the other classes and needs to do a retest. Asuka, Kouji, Maria and Tsutomu are assigned to help Jin with his studies as his test score is zero. Jin tries to run away, but in the end can't escape.
The next day, right before the retest, Jaku Beast Testora appears and Class 5-3 needs to sortie. After defeating the Jaku Beast, Class 5-3 does the retest much to the dismay of Jin.
A couple of days later the tests are graded and Jin has 80 points.
Protect the Field of Flowers!E4 · 24 min
During an excursion, the boys of class 5-3 gets into a fight with the boys from the local. Meanwhile Kouji meets a girl called Kozue, who explains that the locals are angry that more and more trees are being cut for the expansion of the park for tourists.
The next day, Class 5-3 hears that Onoboori mountain (the place they went yesterday) became treeless and a Jaku Beast is attacking. Still remembering the fight, Jin is reluctant to sortie. Kouji insist, saying it's their duty as the defenders of Earth and manage to convince everyone including Jin. With the help of the locals Raijin-Oh manage to defeat the Jaku Beast.
Decision! Unrivaled Dragon TailE5 · 24 min
Survive the Traffic War!E6 · 24 min
Taking Care of DrunkardE7 · 24 min
Absolute Union of Friendship!E8 · 24 min
Blowing Away Moldy FeelingsE9 · 24 min
The Town Where Gasoline VanishedE10 · 24 min
Cookie's NightmareE11 · 24 min
The Pool is Too HotE12 · 24 min
Get Back the Baby!!E13 · 24 min
Final Match! BaseballE14 · 24 min
Fly at Mach 9!E15 · 24 min
Crash Course in Returning the Shot!E16 · 24 min
Teacher is a Jaaku Beast!?E17 · 24 min
Presentation! Earth Defense Class' SecretsE18 · 24 min
Seaside School is in Chaos!!E19 · 24 min
Maria has Disappeared!E20 · 24 min
The Enemy is Raijin-Oh!?E21 · 24 min
Departure! The Invincible WarriorE22 · 24 min
Come Forth! Absolutely Invincible Union!!E23 · 24 min
Dog/Cat Panic Plan!E24 · 24 min
Getting the Scoop!!E25 · 24 min
Great African Battle!E26 · 24 min
Defeat the EarthquakeE27 · 24 min
Garuma's Competition of Fear!!E28 · 24 min
Appear! Super Jaaku BeastE29 · 24 min
Jaaku beast is a Friend?E30 · 24 min
Fierce Battle! Channel WarE31 · 24 min
Adventure in the Haunted HouseE32 · 24 min
Terror! Dancing Jaaku BeastE33 · 24 min
Skiing is Too ColdE34 · 24 min
Vanished CommanderE35 · 24 min
Jaaku Beast is an Ally of Justice!?E36 · 24 min
Graffiti RevoltE37 · 24 min
Psychic JinE38 · 24 min
The Celebration is a Troubling ThingE39 · 24 min
Belzeb's Great ApproachE40 · 24 min
Kidnapping of the Absolutely InvincibleE41 · 24 min
Protect the Secret of the School!E42 · 24 min
Super Giant Reiko Appears!E43 · 24 min
Decisive Micro-Battle!E44 · 24 min
Broadcast! Earth Defense Class Facts!!E45 · 24 min
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