Touch Equipment Girl

Humanity has multiplied too much. The world's immune system has bared its fangs at mankind. That immune system took the form of tentacles. They parasitize within women's wombs and kill men. The protagonist, Rindo Ninomae, whose beloved younger sister has been parasitized by tentacles, continues to hide this fact. Even if his beloved sister's body is developed by them. And Rindo, the only male to be parasitized by the same tentacles as his sister, became a "Tentacle-Equipped Girl." This is the story of two people—once siblings, now sisters—who became enemies of humanity, the women parasitized by tentacles, and mankind itself.