noun, noun which may take the genitive case particle 'no'
curtain-raiser; prologue
Refers to the opening act of a play or, by extension, the beginning of an event. Often used metaphorically for the start of something significant.
その事件は戦争の序幕となった。
That incident became the prologue to the war.
The curtain rose on the opening act of a new era.
式典の序幕は国歌斉唱で始まった。
The ceremony's curtain-raiser began with the national anthem.
His election opened the curtain on the reforms.
This incident marked the opening act of the war.
序章 refers to the introductory chapter of a book or story, whereas 序幕 specifically evokes the opening act of a stage play or a dramatic beginning.
プロローグ is the borrowed English word for a prologue, used interchangeably with 序幕 in more casual or modern contexts.
発端 is a neutral term for the origin or trigger of an event, while 序幕 carries a theatrical, dramatic connotation of an opening act.
終幕 is the closing act or final curtain, the direct opposite of 序幕, which is the opening act.
From 序 (jo, 'beginning') + 幕 (maku, 'curtain'), referring to the opening curtain of a theatrical performance.