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The main character is a scientific genius boy named Kiteretsu, who has built a companion robot named Korosuke. He frequently travels in time with his friends and Korosuke in the time machine he built. Miyoko is a girl in his neighborhood who is basically his girlfriend. Tongari is his rival, who happen to share some similar traits of Honekawa Suneo. Buta Gorilla is a typical neighborhood bully, who also share similar traits of Gian except that he often antagonizes Korosuke (though they are in grade school).

1989

Miyo-chan says she can't study unless it's quiet. Eiichi and Korosuke create a sweet little home in the sky just for her. But when Butagorilla and others discover it, the peaceful hideout is taken over.

Fed up with Butagorilla's selfish acts, Eiichi builds a "strict justice" device that won't overlook even tiny misdeeds. It works too well, and the punishment starts affecting more than the target.

Eiichi's dad is threatened by criminals! To protect him, Eiichi invents a small bodyguard robot and a "shooting" mic device, then heads out to stop the crooks. But the chase is more dangerous than planned.

It's school observation day, and parents come to class. Somehow Korosuke also shows up with Eiichi's dad! After a clash with Butagorilla's father, rivalries explode during a parent-child baseball tournament.

Korosuke carelessly brings out an invisibility cloak, and Tongari steals it. Invisible, Tongari pulls pranks nonstop. But when the cloak's knots can't be seen, he gets stuck and ends up lonely and afraid.

To meet Thomas Edison, Eiichi builds an improved time machine. While he's away, Butagorilla and Tongari activate it and land in 19th-century America. Lost and reckless, they stumble into dangerous trouble.

Eiichi invents icy "water clay" that can be shaped like modeling clay. The kids use it to cool off and build things for summer fun. But the strange material leads to surprises when their creations go too far.

Korosuke wants to power up like a super robot, but Eiichi says upgrades cost money. Determined, Korosuke starts part-time jobs to earn cash. His clumsy work causes mishaps, but he keeps trying.

Butagorilla complains that a marathon is too long and insists it should be 35 killometers. Eiichi and friends travel to ancient Greece to measure the course and change history. Their plan to rewrite the race hits obstacles.

Eiichi's TV breaks, and Korosuke begs for a new one. When the neighborhood sports day announces a big-screen TV as the MVP prize, everyone gets fired up. Rival teams clash as they compete for the reward.

Eiichi and Ben are forced to attend Butagorilla's party. To survive the food, Eiichi invents a seasoning that makes anything taste like croquettes. The prank works-until flavors get out of control.

Eiichi uses a memorization lamp that boosts memory to ace a language test. Word spreads, and Butagorilla seizes the lamp for himself. Eiichi must get it back before the power is misused.

1988

Eiichi dreams of his ancestor, Master Kiteretsu, who asks if the Encyclopedia is truly useful. Waking up, Eiichi rethinks how he uses inventions with Korosuke and what they mean for everyday life.

Ben-chan, the neighbor, is crushed after being rejected. To cheer him up, Eiichi makes an invention meant to attract romance. But helping love along proves trickier than expected.

Inspired by Master Kiteretsu's sketches of the moon, Eiichi attempts what even his ancestor couldn't: a trip to the lunar surface. With a homemade rocket and gear, he launches into a risky adventure.

A landslide traps Eiichi and friends inside a dark cave. As the air runs thin, fear rises. Eiichi searches for a way out, wishing he had a wall-passing invention to save everyone.

Eiichi and Korosuke use the Tengu Tunnel, which bends space to travel anywhere instantly, for an easy hike. Butagorilla's jealousy over their barbecue sends him into the forest, and the outing goes off course.

A mechanical warrior stored in the shed suddenly starts rampaging around town. Someone has taken its controller! Eiichi and Korosuke investigate who did it and try to stop the chaos before anyone gets hurt.

With the "Trial House," pretend play feels real. Dreaming of the future, Eiichi uses it to experience an ideal home life with Miyo-chan. But acting out fantasies brings surprises-and complications.

Eiichi plans a special-effects movie using a "zero-gravity" setup, casting Korosuke as the star and roping in Miyo-chan and Butagorilla. Once filming begins, the set turns into pure chaos.

Mysterious thefts strike the neighborhood. Eiichi and Korosuke use a camera that shows the past to retrace events and catch the culprit. The clues are there-but the truth is tricky.

TV reports claim a baby dinosaur has appeared off the coast of Kochi. Eiichi notices the silhouette matches a "dinosaur boat" invention he left behind. He and Korosuke hurry to recover it before panic spreads.

A friendly older neighbor visits, but Eiichi has plans with Miyo-chan. Torn between promises, he considers using a duplication machine to be in two places at once-only to learn that copies bring complications.

Ben pushes himself to study nonstop, hoping to change his life. Worried he's too stressed, Eiichi builds an invisibility machine so Ben can take a break. But disappearing from problems isn't a real solution.

1990
Streaming availability information not available

1991