ストライクウィッチーズ あなたとできること A Little Peaceful Days

One day, the world is invaded by a monster called "Neuroi". One and only hope for the humans is the "Strike Witches". The witches are sent to an isolated island for exercises. However, they are attacked by Neuroi on their way to the island! Since the aircraft carrier gets damaged, it leaves them on the island and returns to the base. Therefore, they will need to stay on the island until the support arms join them....