@kenzaburo03,
I've just tried this myself, it seems to be working OK.
When you created your column did you have:
Lookup name: hyphenated (NB must be all lowercase)
Column heading: anything you like
Column type: Text, column shown in tag browser
Then in the Hyphenate This plugin Settings option:
Column name: #hyphenated (NB must have the # in front of your custom column name)
Then, when you hyphenate some epubs you should see your custom column populated with the relevant text (as per your Settings).
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