Bye-Bye, Earth tells the story of Belle Lablac, the only human in a world inhabited by humanoid animals. Referred to as Faceless due to her lack of fangs, fur, or scales, Belle lives a lonely life as no one can relate to her. With a burning desire to belong, she sets out on a journey with her companion sword Runding to uncover her origins. Little does she know the challenges that await her along this path of self-discovery.