After Being Dumped, I Killed the UFO with My Sword

Three days ago, a visitor from an alien civilization arrived, a giant UFO that far exceeded human technological imagination. In eight hours, they will implement the human elimination plan. At the last moment when everyone fell into despair, a sword shadow appeared in the sky. With a wave of his hand, the entire space battleship suddenly shattered! "A mere second-level civilization dares to make trouble in our Blue Star?" From then on, a whole new world was unveiled in front of mankind. . However, they didn't know that this all-powerful swordsman had just been dumped by his girlfriend a few hours ago... This book is also called Every Single Guy Is a Hero and tells you not to break up with your otaku boyfriend no matter what. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.