Shinshoku -Zero- -Inma no Ikenie | 侵蝕-零- ～淫魔の生贄～

Genmu that had come to the ruins survey to this world, in the experimental facility of ancient times where the life evolution is simulated, it tried to obtain the source of the magic. And three sisters who strayed are used, to advancing the inquiry of the labyrinth.

Though the door of ruins was not able to be opened by Genmu, apparently ruins seem to start reacting on the living thing that is appropriate the mother's body. And three sisters second daughter Haruka show the aptitude, Sisters come to be taken into the labyrinth to be supplied to the hybridization experiment with the living thing of tentacle.

Afterwards, three people who began to help Genmu, though the event in ruins is convinced tp be the dream, haruka is called to the ruins and is...