import json
import requests

url = "https://2ch.hk/b/res/262396698.json"

thread_content = requests.get(url)
json_data = json.loads(thread_content.text)

for thread in json_data['threads']:
    for post in thread['posts']:
        for file in post['files']:
            file_name = file['name']
            full_url = "https://2ch.hk/" + file['path']
            r = requests.get(full_url, allow_redirects=False)
            open(file_name, 'wb').write(r.content)