Master, What Is Love?

Mikoto makes her living exploring ruins. During one investigation, she discovers a beautiful girl fast asleep. Calling herself Cipher, the girl has lost every memory except her name and can use equipment and weapons Mikoto has never seen before. Cipher calls Mikoto her master. But Mikoto, known as the "Humanoid Disaster," is far from pleased and doesn't want to be with anyone... Still, Cipher uses her military might to deal with the disasters that befall Mikoto. With a girl this dependable, it looks like she's interested in "dating." And so begins a "romance" between a humanoid disaster and an ultimate weapon.