Write a Compelling Short Story Opening

Write the opening 3 paragraphs of a short story with the following details:

Genre: [e.g. psychological thriller / sci-fi / literary fiction]
Setting: [e.g. near-future Tokyo / a small coastal town in winter]
Main character: [name, age, one defining trait]
Central tension: [the core conflict or mystery that will drive the story]

Requirements:
- Start in the middle of action or a charged moment (in medias res)
- Establish the character's voice clearly in the first paragraph
- Plant at least one detail that will feel significant in retrospect
- End the third paragraph on a sentence that makes it impossible not to read on
- Avoid clichéd openings (waking up, looking in a mirror, weather descriptions as the first line)

Tone: [e.g. tense and claustrophobic / wry and observational / lyrical and melancholic]