なり（する）
“As soon as … / Immediately after …” → Used to express that one action happens immediately after another, with no interval, often emphasizing quick reaction or decisive movement.
N1
Meaning
“As soon as … / Immediately after …” → Used to express that one action happens immediately after another, with no interval, often emphasizing quick reaction or decisive movement.
Formation
Verb (dictionary form) + なり
Verb (dictionary form) + なり + Verb (する／した)
Explanation
なり（する） is used to describe a situation where:
Action A happens
Immediately, Action B follows
There is no pause, no deliberation, and often no intention is stated — the focus is purely on sequence and immediacy.
This grammar is commonly used in:
written narratives
reports
formal descriptions
JLPT N1 reading passages
It often gives a dramatic or descriptive tone, showing swift movement or reaction.
💡 Core nuance:
“The moment X happened, Y followed.”