書かき下おろし

noun, noun which may take the genitive case particle 'no'

newly written work; original work

Refers to a work (novel, play, music, etc.) created specifically for a particular publication, performance, or event, rather than a reprint or adaptation. Often used in publishing and entertainment contexts.

• この雑ざっ誌しには有ゆう名めい作さっ家かの書かき下おろし短たん編ぺんが載のっている。

  This magazine features a newly written short story by a famous author.