Born into a prestigious family of master swordsmen, Elymas Edvaughn's future shatters when he awakens the so-called "defective" Heavy Knight class. Disowned and cast out, he regains memories of another life—and realizes this world mirrors a VR game he once mastered. Armed with knowledge no one else possesses, he sets out to rewrite his fate and prove the strength of the "weakest" class.

Robotic invaders wiped out all life, but Renge fights to survive using her powers. With no memories, she roams the city until she meets five other young women, each with unique abilities. Together, they make the most of their lives, cooking delicious meals between battles with mechanical monstrosities. As they uncover the secrets of their powers and pasts, they find strength in their friendship.