noun
original scenario; original screenplay
Refers to a story or script created from scratch, not based on existing material. Common in film, TV, and game contexts.
この映画はオリジナルシナリオで制作された。
This movie was produced from an original screenplay.
彼はオリジナルシナリオを書くのが得意だ。
He is good at writing original scenarios.
Variant with interpunct; less common in running text.
原作 refers to an original work that is adapted into another medium (e.g., a novel adapted into a film), while オリジナルシナリオ is a script written directly for the screen without a prior source.
Loanword compound from English 'original' + 'scenario'.