A kid gets a magic invention kit in the mail and has to figure out what it actually does by building it wrong on purpose. Every episode is basically "what happens when you follow the instructions but skip the one step that matters." It's the opposite of every other kids' show that punishes you for messing up.
Eiji is a fifth-grader obsessed with building things, and his dog Pochirou is his constant creative partner. When a mysterious book called the Pikachin Research Book appears in their lives, everything changes. A single button press summons a delivery box containing seven peculiar tools, each one a puzzle waiting to be assembled into something new. The catch: no matter how carefully Eiji follows the blueprints, there's always something missing. That final 1% can only come from pure inspiration, that spark of brilliance that turns a pile of plastic into something impossible. What follows is a series of wacky, high-energy adventures where Eiji and Pochirou build increasingly absurd gadgets to solve everyday problems. Every invention explodes with chaos and unexpected consequences, leading the duo on ridiculous quests that spiral into comedy gold. The show celebrates the joy of creation itself, where the messy process of building something, failing, and trying again is just as entertaining as any success. It's inventive humor wrapped in genuine warmth about friendship and never giving up.