noun
Used for a story, film, or game that depicts events before an existing work. Common in entertainment contexts.
この映画は人気シリーズの前日譚だ。
This movie is a prequel to the popular series.
Refers to a talk, article, or event that reviews past events or history. Less common than the prequel sense.
彼の講演は会社の歴史の前日譚だった。
His lecture was a retrospective on the company's history.