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The quotation marks themselves provide signal. By then tying the line of dialogue to an action in the same paragraph, it's clear that Kiyoshi is speaking. If anybody else were doing the speaking ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/28730 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The quotation marks themselves provide signal. By then tying the line of dialogue to an action in the same paragraph, it's clear that Kiyoshi is speaking. If anybody _else_ were doing the speaking you'd need to say so, but that's not the case here. Beginning writers sometimes make the mistake of attaching attribution -- he said, she asked, Bob mumbled, etc -- to every single piece of dialogue. Don't do that; they get in the way when not needed, and if you establish the context they won't be needed very much. (Occasionally you'll need one, especially if more than two people are speaking; I'm not saying to banish them entirely. But you don't have to use them liberally either.)