Written by: Jin Fujisaki / Published: 2026-02-24
After studying or working, your desk ends up scattered with piles of eraser shavings. Gathering them by hand and tossing them in the trash is a hassle, and everyone has experienced the frustration of static electricity making them stick to your hand or fall onto the floor. The product that solved this "eraser shaving problem" with magnetic force and became a huge hit is Kutsuwa's "Ji-Keshi" series. The latest and arguably ultimate evolution of this lineup is the product we're introducing today: the "Ma-Ji-Keshi" (Magi-Keshi).
Its greatest weapon is the fact that ferrite (iron powder) is kneaded into the eraser itself. On top of that, an ultra-powerful neodymium magnet is built into the bottom of the case. After erasing some text, simply bring the bottom of the case close to the desk, and the scattered shavings get pulled toward the magnet with such force you can almost hear them snap into place with a "zap!" The satisfying sensation of that instant attraction has a strange addictive quality that never gets old, no matter how many times you do it.
| Controlling the Magnetism with a Simple Cap On/Off
image: Kutsuwa
What decisively sets the Ma-Ji-Keshi apart from previous Ji-Keshi models lies in the gimmick of "what to do with the shavings you've collected." Conventional models worked like this: while the shavings were still stuck to the case, you'd carry them over the trash can, slide a switch to turn off the magnetism, and let the shavings drop.
The Ma-Ji-Keshi, however, comes equipped with a "shaving cap." When you remove this cap, the internal magnet automatically drops down, switching to the "magnet ON" state. You collect the shavings as usual, and when you click the cap back on, the magnet retreats upward into the "magnet OFF" state, causing the clinging shavings to plop down into the cap and accumulate inside. It's a brilliant physical gimmick reminiscent of a magic trick or a puzzle box.
| Complete Liberation from the Tragedy of "Spilling Halfway"
image: Forest Way
This "stored inside the cap" structure delivers tremendous power in real-world study situations. Previously, in order to throw away the collected shavings, you had to stand up each time and walk over to the trash can. Along the way, there were no shortage of tragedies in which your hand slipped and all those carefully gathered shavings ended up dumped on the floor.
With the Ma-Ji-Keshi, the collected shavings can be temporarily stored inside the cap, so there's no need to interrupt your studies and head over to the trash. The whole sequence of "erase → gather → store in the cap" is completed right on your desk, and once the cap is full, you can simply throw it all out at once later. It's an extremely well-reasoned design that prevents your concentration from being broken.
| A Long-Lasting Companion, Thanks to Dedicated Refill Erasers
image: Kutsuwa
The case is made of solid, thick plastic material, with a stylish square form that has real presence even inside a pencil case. There's a full lineup of 8 colors, ranging from chic black and khaki to pop mint, pink, and purple, so anyone—regardless of gender—can find a favorite shade.
"When the eraser runs out, do I have to throw away this whole nice case?" There's no need to worry about that. Kutsuwa also sells dedicated "Ma-Ji-Keshi Refill Erasers." Once you buy the main unit, you can keep using it for a long time by swapping out the inside (165 yen including tax)—an eco-friendly spec that's kind to both your wallet and the environment.
| Summary: Get a "Clean" Desktop for 550 Yen
image: Bunguya.com
The price for the main unit set is 550 yen including tax. Paying over 500 yen for what's "just an eraser" might sound a bit pricey, but if you think of it as a magical gadget that transforms "the stress of cleaning up shavings" into "the joy of collecting shavings (entertainment)," the cost-effectiveness is outstanding.
The "Kutsuwa Ma-Ji-Keshi" is more than just a tool for erasing text—it's a groundbreaking instrument that gives you the motivation to keep your desk consistently tidy. Before yelling "Go study!", try quietly handing one of these Ma-Ji-Keshi over instead. Chances are, they'll get hooked on the fun of erasing text just to clean it up again.
