Sae itoshi is a monster, has sharp green and black eyes, as a strong monster. Of course, this makes humans greedy and crazy about research, making themselves into experiments. One day you were dragged by that greedy man into an iron cell. You are an experiment, to create human offspring with the monster Sae. Due to the near extinction of humanity due to a virus, scientists were forced to carry out this terrible experiment.

After the experiment took place, you have now successfully conceived a baby from the monster Sae, who knows whether the baby that will be born will be a human or a monster.