c7h8n4o2. The chemical formula for theobromine — the alkaloid that gives cacao its native bitterness, its faint warmth on the tongue, its reason for existing in a world already full of sugar. Spelled out in atoms and subscripts, it looks like something from a lab notebook. Pronounced aloud in Japanese, it becomes Chokogakari — roughly, "the one in charge of chocolate."
The name belongs to Kodama Suzurina. And the store it names — tucked into the ground floor of Shibuya Scramble Square, surrounded by the sweet, heavy air of a confectionery hall — is not quite like any other chocolate shop I have walked into. No gilded displays, no towers of ribbon-tied boxes. Just a careful selection of bars and bonbons from makers around the world, arranged with the quiet confidence of someone who has tasted everything on the shelf and means every piece.
Theobromine and the shape of an obsession
Bitter chocolate that lets the cacao speak without interruption. Milk chocolate so gentle it dissolves before the sweetness fully registers. Ganache layered with fruit, with nuts, with liqueur — each piece a small, self-contained argument for what chocolate can be.
The world of chocolate, when you look at it closely, is not so different from the world of tea. There are varieties of cacao just as there are cultivars of tea. There is terroir — the soil, the altitude, the rainfall of each growing region shaping the raw material before any human hand touches it. There is fermentation. There is roasting. And at every stage, a decision that nudges the final flavor in one direction or another.
We at FETC spend our days selecting Japanese teas — sorting through cultivars, comparing harvests, trying to find the cups that feel worth sharing. Kodama-san does the same thing with chocolate, except her search covers the entire world.
A shop named in molecules
The first floor of Scramble Square is a corridor of color and confection. Display cases gleam. The air is layered — butter, vanilla, roasted nuts — and somewhere in the middle of it all, a narrow counter lined with bars and boxes from makers most visitors have never heard of. This is c7h8n4o2.
"The name originally did not have a reading at all," Kodama-san says. "It was just the formula. But when we opened at Scramble Square, they needed something pronounceable. I had been calling myself minna no Chokogakari — everyone's chocolate person — so that stuck."
c7h8n4o2 started as an online shop in 2015. By 2019, it had its first physical space inside Tokyu Food Show Edge at Shibuya Scramble Square — and with it, a reputation as the place where Japanese chocolate lovers go when they want something they cannot find anywhere else. Not a patisserie. Not a bonbon atelier. A select shop, in the purest sense: one person's taste, made available to everyone.
"I just like it, that is all"
I asked Kodama-san how she chooses what to stock. Whether there is a framework — origin percentages, cacao content, some system of evaluation that filters the thousands of chocolate makers in the world down to the few dozen on her shelves.
"No real criteria," she says, and the answer comes without hesitation. "I do not import a chocolate because of what it is. I import it because I like it."
She says this with a laugh, as though the simplicity of it might be embarrassing. It is not. It is the most honest thing a curator can say.
In tea, the variables are similar — the balance of umami and astringency, the fragrance shaped by cultivar and processing, the personality that either draws you back or does not. We at FETC select our teas the same way, if we are being truthful. The vocabulary of evaluation comes after the instinct. You taste something and you know.
Kodama-san knows.
Four brands, four stories
c7h8n4o2 carries chocolates sourced through other importers, but four brands Kodama-san imports herself — directly, with no intermediary. CHOCOLATARIA EQUADOR from Portugal. Idilio Origins from Switzerland. Barbero from the Piedmont region of northern Italy. Claire Mari from the south of France.
"CHOCOLATARIA EQUADOR was the first. I was at a food exhibition in Portugal, and my hotel happened to be nearby, so I kept walking over. After a few days of visiting, I started talking with the people there — and somehow it turned into an import arrangement."
The pattern repeats. With another brand, the connection started through a conversation on Twitter — a maker who had never exported chocolate to Japan found themselves shipping to Shibuya because Kodama-san liked what they made. With another, the previous Japanese distributor was closing down, and Kodama-san stepped in to take over the import — not as a business opportunity but because she could not stand the thought of those chocolates disappearing from the market.
"CHOCOLATARIA EQUADOR makes these chocolates with layers of fruit ganache inside. I love those. They have also started growing their own cacao recently, and the bars from their own beans have a character you do not find elsewhere."
"Barbero — the Piedmont is hazelnut country, so their chocolates made with local hazelnuts are exceptional. The roast on the nuts, the way it folds into the cacao — it is a pairing that has existed in that region for centuries, and they do it as well as anyone."
"Claire Mari is southern France, so lemons. Their citronette — candied lemon peel dipped in dark chocolate — is the one customers reach for again and again. The bitterness of the cacao against that bright, citric sweetness. You bite through the snap of tempered chocolate, and then the peel hits — tart, fragrant, almost floral."
She describes each brand without pausing to think. The tasting notes arrive as naturally as if she were describing friends. She visits these makers in person, nearly every year — not for quality control, not for contractual obligation, but because they are part of her world and she wants to see what they are making now.
Listening to her, I realized something had shifted in me. A trust had formed — not in any single bar or brand, but in the person doing the selecting. Chocolate chosen by someone who loves chocolate this much, who travels to meet the people behind it, who can recall the texture of a ganache she tasted three years ago in Lisbon. That, on its own, felt like enough.
Trust that travels from hand to hand
"When someone comes to the counter, I always start with a few simple questions," Kodama-san explains. "Sweet or bitter? What do you usually drink with chocolate — coffee, wine, something else? Is this for yourself or a gift? When will you eat it? From there, I can narrow it down."
This is not upselling. It is navigation. The shelves hold dozens of options from a dozen countries, each with its own cacao origin, roast profile, texture, finish. Without a guide, the abundance is paralyzing. With Kodama-san, it becomes a conversation — her knowledge meeting the customer's appetite, and something good emerging in the middle.
Tea and chocolate share this particular quality: by the time they reach the shop, they are finished products. We cannot alter the roast, the fermentation, the grind, the temper. All we can do — all any of us can do — is choose well and explain honestly. The trust a customer places in a shop like c7h8n4o2 is, in the end, trust in the taste of the person behind the counter.
Kodama-san's trust in her chocolates — unshakable, specific, grounded in years of tasting and traveling and talking with the people who make them — becomes the customer's trust in her. And the customer, leaving the shop with a box they did not choose alone, carries that trust home.
It is a chain that only works if the first link is genuine. Kodama-san's is.
"Eat what you think is good"
Before we left, I asked Kodama-san if she had any advice for people who want to enjoy chocolate more deeply.
"Eat it freely," she says. "Do not eat chocolate because of what you know about it — eat it because it tastes good to you. Expensive chocolate is fine, but a bar from the convenience store can be just as satisfying. What you crave changes day to day. The only rule is to trust your own palate, not someone else's opinion."
The words could apply to tea just as easily. A cup from a hand-thrown kyusu has its pleasures, and so does a cup from a tea bag on a busy morning. Neither cancels the other. The point is not expertise — it is attention. Noticing what you enjoy, and letting that be enough. What changes with each day, each season, each mood. The chocolate you want on a cold February evening is not the chocolate you want on an August afternoon, and neither choice is wrong.
c7h8n4o2
Read as Chokogakari — from the chemical formula for theobromine.
Shibuya Scramble Square B1F: 2-24-12 Shibuya, Shibuya-ku, Tokyo