This is a story about a typical guy who still lives with his mother and due to unforeseen circumstances will be forced to help an alien girl. While traveling through our galaxy, an alien girl was attacked by a hostile race.
Her ship crashed near the protagonist's city and therefore, having no other way, she escaped through a cave that led her to a sewer and a secret bunker. Other aliens are pursuing her, wanting to turn her into a sex slave because of her appearance.
Immediately after the shipwreck, she activated the machine gun, which was her only defense before meeting Arron.