Kekkou desu: yes to what, no to what?

Keep the size, leave out the bag

Imagine ordering a photo print. We wrote this exchange to show a shop assistant checking the size:

写真は、この大きさでよろしいですか。／はい、それで結構です。

KYOTOEIC translation

Is this size all right for the photo? / Yes, that size is fine.

The customer has agreed to the proposed size, not cancelled the order. Now it is time to pack it. This second exchange is also an invented example:

新しい袋をお付けしましょうか。／いえ、結構です。手持ちの袋に入れます。

KYOTOEIC translation

Would you like a new bag? / No, thank you. I'll put it in the bag I brought.

Here the customer declines the new bag. Both replies include kekkou desu, but one answers a check about a chosen size; the other answers an offer of an extra item. The second reply also specifies an action: using a bag the customer already has.

The dictionary examples do not all point one way

NINJAL's entry for kekkou includes accepting an available seat and saying that a phone call is sufficient, alongside declining help or coffee. It also gives permission to visit. These examples cannot all go into a single box marked either acceptance or refusal.

Masaru Inoue's explanation published by NINJAL introduces ii desu and kekkou desu together, then explicitly uses ii desu to represent them in the discussion. It considers accompanying words, gestures and intonation as well as context. We do not turn its specific discussion of the intonation of ii desu yo into a pitch test for kekkou desu on its own.

For the photo order, pairing a reply with its question is more useful than memorising numbered dictionary senses. Did the customer say “that size” when asked to confirm it? Or say no to an extra item and produce a bag? The assistant can process the order without diagnosing the customer's personality.

Thanks can still leave a question unanswered

The public extra food scene explicitly says that the assistant could not tell whether the customer accepted or declined. The dialogue contains kekkou desu and thanks, but supplies no further cue that settles whether to provide the food. Thanks alone do not decide the answer in this question.

The already eaten scene supplies a reason. Food is being offered for people who have not eaten, and the speaker says they already have. This narrows what “I'm fine” concerns: the speaker does not need more food. That difference changes the reading more than counting expressions of gratitude would.

Name the item when you check

If the bag is in doubt, an assistant could ask, “Shall I give it to you without a bag?” For the photo size, “Then I'll print it at this size” names the action to be taken. Either makes the pending task more explicit than another bare “So that's all right?”

The Korean and English translations of our examples keep those details. The first preserves the chosen size; the second preserves the bag the customer brought. We have not reduced both replies to the same yes or no. For these orders, following the work already described around the short phrase is more useful than adding a secret meaning to it.