Good morning, it’s まさきん.
I came across some buzz about Kai’s new product, “Nadesori.” My daughter might be getting close to the age where she starts worrying about unwanted hair. I haven’t tried it myself yet, but I wanted to look into it ahead of time, just in case.
What Kind of Product Is Nadesori?
Nadesori is a new-concept razor that Kai launched in May 2026. The idea is simple: just glide it over your skin in circular motions, like you’re stroking it, and the hair gets swept away.
The blade sits inside a pentagon-shaped head. Unlike a typical T-shaped razor, you don’t have to worry about which direction you’re moving it in.
The blade comes with a resin guard, built with a comb-like structure designed to keep it from nicking your skin even if it slides sideways.
It’s priced at ¥1,100. No water or shaving foam needed — you can use it anytime, right on dry skin. It’s meant for ages 10 and up, and it’s designed for arms and legs.
The Backstory Behind Its Development Made Sense to Me
Nadesori came out of an internal product development competition at Kai. Apparently, it took four years to develop.
During development, Kai surveyed 300 boys and girls aged 10 to 15 about their first experience dealing with unwanted hair. A high percentage of them started somewhere between the upper grades of elementary school and junior high, and a razor was the most commonly used tool.
Parents said things like, “I worry about injuries if it’s not used correctly.” Kids, meanwhile, said things like, “It’s hard to use with my non-dominant hand.” The blade’s guard structure was designed to address both of these concerns.
Apparently 94.3% of doctors surveyed recommend it as safe and easy to use. That’s a number I want to hold onto myself, as a bit of reassurance.
Apparently, Age Alone Doesn’t Have to Decide When to Start
A dermatologist also spoke at the Nadesori launch event. According to them, you don’t need to decide when to start hair removal care based on age alone, across the board.
What matters most, apparently, is checking in on how much the child themselves is bothered by it. Rather than shutting it down right away with “you’re too young for that,” it’s important to take the attitude of listening to what’s actually bothering them.
The worry that “shaving makes hair grow back thicker” is something you hear a lot, too. In reality, the hair itself doesn’t actually get thicker — it just looks that way because the cut end becomes flat.
Taking a Look at the Reviews
I also checked out a few reviews from people who’ve actually used it.
On the positive side, a lot of people mentioned not needing any prep beforehand. Being able to use it while watching TV seemed like a nice perk. There were also comments about feeling comfortable handing it to their kids, since the blade doesn’t touch the skin directly.
On the other hand, some said it’s hard to get a really smooth, close shave with it. There are apparently some spots, like underarms, that are trickier to shave. And if you don’t moisturize properly afterward, your skin can get irritated.
This is a fully disposable product — once the blade wears out, you replace the whole razor rather than swapping out just the blade. I also found reviews from parents with kids around the same age as my daughter, which I found especially helpful.
Things to Watch Out for When Buying One
Nadesori became popular right after launch, and it sounds like it’s still in short supply. Apparently, you can’t always find it at the list price of ¥1,100, and there are cases of it being resold for more than double that.
The major e-commerce malls seem especially prone to running low on stock. Apparently, you sometimes have better luck finding it at list price through supermarket online ordering or home center websites.
Rakuten Ichiba carries it too, but at the time I checked, it was priced at ¥1,580 — a bit higher than the list price.
There’s also apparently a Toy Story collaboration model. Being able to pick a design your kid might actually like is a nice touch, too.
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Wrapping Up
Even small purchases for kids add up and quietly chip away at the household budget over time. Reviewing your monthly fixed costs ahead of time seems like one reasonable way to prepare for these one-off expenses.
Nadesori is a product built around a design where the blade doesn’t touch the skin directly. The convenience of not needing water is appealing, too. Rather than deciding based on age alone, it seems best to listen to how the child themselves feels about starting.
When my daughter reaches that point, I’d like to use it as an opportunity to review our overall household budget, including our mobile costs.
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