Prima Doll: Mumei Tenrei is the second volume of the kinetic novel series based on the multimedia project Prima Doll. It is a prequel to the anime series focused on the character Houkiboshi.

Due to Ouka's rampage, the battlefield is dominated by mechanical dolls. There was a nameless imperial soldier who secretly infiltrated the city for a certain purpose. In a city where there are no living beings, he meets a support doll Houkiboshi who miraculously survives the outbreak. The two will try to escape this hell hand in hand.