download_url_squ.sh

#!/bin/bash

if [ -z "$2" ]; then
    echo "Usage: <dir_name> <url>"
    echo "  <url> support printf format and continue to download until fail"
    exit 1
fi

mkdir "$1"
cd "$1"

for ((i=1; ; i++)); do
    url=$(printf $2 ${i})
    if [ -f $(basename "${url}") ]; then
      continue
    fi
    sleep 1
    wget "${url}"
     # Check the exit code of wget
    if [ $? -ne 0 ]; then
        echo "Download failed. Bye."
        break
    fi
done

For example:

./download_url_squ.sh "けもみみメイドといちゃいちゃする本3さつ目" https://img3.qy0.ru/data/1216/35/%03d.jpg