別べっ巻かん

noun

separate volume; extra issue

Refers to a supplementary book or magazine issue published separately from the main series, often with a specific theme or collection.

• この全ぜん集しゅうには別べっ巻かんとして索さく引いんが付ついている。

  This complete works comes with a separate volume containing an index.

• 雑ざっ誌しの別べっ巻かんで特とく集しゅうが組くまれた。

  A special feature was put together in an extra issue of the magazine.