“Special issue” in Japanese
Short answer
Special issue in Japanese is “増刊” (zoukan). Full meaning: special issue (of a magazine, etc.), issuing an extra number.
Other ways to say “Special issue” in Japanese
保存版
hozonban special issue (of magazine, etc.), timeless edition, collector's edition
増刊号
zoukangou special issue, extra issue, special number
特別号
tokubetsugou special number, special issue
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