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.
Episode 1
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.
Episode 2
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.
Episode 3
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.
Episode 4
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.
Episode 5
No overview available.
Episode 6
No overview available.
Episode 7
No overview available.
Episode 8
No overview available.
Episode 9
No overview available.
Episode 10
No overview available.
Episode 11
No overview available.
Episode 12
No overview available.
Episode 13
No overview available.
Episode 14
No overview available.
Episode 15
No overview available.
Episode 16
No overview available.
Episode 17
No overview available.
Episode 18
No overview available.
Episode 19
No overview available.
Episode 20
No overview available.
Episode 21
No overview available.
Episode 22
No overview available.
Episode 23
No overview available.
Episode 24
No overview available.
Episode 25
No overview available.
Episode 26
No overview available.
Episode 27
No overview available.
Episode 28
No overview available.
Episode 29
No overview available.
Episode 30
No overview available.
Episode 31
No overview available.
Episode 32
No overview available.
Episode 33
No overview available.
Episode 34
No overview available.
Episode 35
No overview available.
Episode 36
No overview available.
Episode 37
No overview available.
Episode 38
No overview available.
Episode 39
No overview available.
Episode 40
No overview available.
Episode 41
No overview available.
Episode 42
No overview available.
Episode 43
No overview available.
Episode 44
No overview available.
Episode 45
No overview available.
Episode 46
No overview available.
Episode 47
No overview available.
Episode 48
No overview available.
Episode 49
No overview available.
Episode 50
No overview available.
Episode 51
No overview available.
