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.
Yuji Mitsuya
Mami Koyama
Chieko Honda
Naoki Tatsuta
Toshiko Fujita
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