Ask a Japanese Seller a Question: Mercari and Yahoo! Rules

You found the card. The listing has three photos, one line of condition, and a description written for somebody standing in Japan. The thing you actually need to know — are the back corners clean, is there whitening along the left edge — is not on the page. Both Mercari and Yahoo! Auctions have a box for asking the seller exactly that, but neither box is reachable without a Japanese platform account, and only two of the four major proxy services say they will use it for you.

Can I ask a Japanese seller a question before I buy?

Yes on the platform, usually no in practice. Mercari has a public comment thread on every listing and Yahoo! Auctions has a question form on every auction — but both require a Japanese account, and Mercari’s own help center describes overseas residents as customers who cannot use Mercari. So the question box exists and you are standing on the wrong side of it.

Here is what each route actually offers, checked against the platforms’ own help pages on August 5, 2026.

The pattern is the same everywhere: the information exists, but it only comes into existence if a Japanese-reading person types a question into a Japanese box. Nobody generates it for you in advance.

Will other people see the question I asked?

On Mercari, yes, from the second you post it. On Yahoo! Auctions, not at first — your question is visible only to you and the seller — but the moment the seller answers, Yahoo publishes the question and the answer together for every other user to read. That difference changes what it is smart to ask.

Two consequences worth holding on to. First, on Mercari your question is a free advertisement for the listing — you are telling every other watcher that a foreign buyer is interested in this card and that it is worth a second look. Second, on Yahoo! the seller has one shot at answering. Ask three things in one post and you will often get one of them addressed, with no mechanism for a follow-up except a second permanent public question.

Which proxy services will actually ask the seller for me?

Two of the four we read say yes and two say no, and they say it in their own published help pages — this is not a matter of which support agent you get. Buyee and FROM JAPAN both document the request as a normal pre-purchase support ticket. Neokyo and ZenMarket both rule it out in writing.

Read the ZenMarket row twice, because it is the most expensive misunderstanding in this whole article. ZenMarket will photograph your card — but only once the card is in its warehouse, which is after the purchase is final. That is a receipt, not a decision tool. FROM JAPAN’s trading-card clause pushes in the same direction: its Q&A lists items with minor scratches, damage or color differences, and items requiring specialized knowledge to determine authenticity, as not eligible for compensation, then recommends its paid photo service after purchase to prevent problems.

So on the two services that will not ask, every question you have about a raw single stays unanswered until money has changed hands.

Why doesn’t the seller know I exist?

Because in the seller’s paperwork, you were never the buyer — and that is by design, stated on Mercari’s own page. Mercari’s cross-border support page explains that officially linked operators buy from Mercari sellers on behalf of overseas customers who cannot use Mercari, ship to a Japanese address, and handle export and customs. Then it reassures sellers directly: because all dealings with overseas customers are handled by the cross-border operator, no communication with the overseas buyer arises.

Buyee says the same thing from its side of the counter — as far as the seller is concerned, Buyee is the winner of the auction, so Buyee asks customers not to contact sellers directly, to avoid miscommunication and delays.

This is not a service failing. It is the product working exactly as specified. It also explains why Mercari’s rulebook is not going to help you: Mercari’s prohibited-conduct page lists shipping items overseas as a prohibited act for sellers, which is the whole reason the proxy layer exists in the first place. If you want a fuller comparison of that layer, we have one in Japanese proxy services compared for cards and a head-to-head in ZenMarket vs Buyee for Pokémon cards.

What is actually worth asking about a card?

One thing, phrased so the answer is a photo rather than an opinion. A seller who is asked “what condition is this in?” will repeat the dropdown they already selected. A seller who is asked for a photo of the back corners under a light either takes it or doesn’t, and both outcomes tell you something.

Those Japanese damage words are the same vocabulary the listing itself is written in, and they are worth learning before you ask anything — we broke the whole set down in Japanese card condition terms explained. If you are still choosing between the two platforms, the trade-offs are in Mercari vs Yahoo! Auctions for cards.

What we could not verify

Two gaps, stated rather than papered over. Neither Mercari’s comment page nor Yahoo’s question page says anything about the language a post has to be written in, so we are not claiming that an English question breaks a rule — we only know that Mercari puts no obligation on a seller to reply and Yahoo leaves it entirely to the seller’s judgment. And no service among the four publishes a price for relaying a question, so we cannot tell you what it costs beyond “nothing is stated.” If a service quotes you a fee for it, that fee is not on the page we read.

What is not in doubt is the shape of the thing. The condition information you need about a Japanese card listing is not written down anywhere. It exists only as an answer to a question that has not been asked yet, in a language you probably do not read, in a box you cannot reach — and half the industry built to bridge that gap has published, in writing, that bridging it is not part of the service.