Embryo

Trama

Some women possess dormant "embryos" within them, which are seeds belonging to supernatural creatures. These embryos typically remain inactive, but a powerful shock can cause them to awaken, manifesting as monstrous entities and wreaking havoc. Narusawa Yu has the ability to subdue and eliminate these mutated embryos. His younger sister, Mikoto, utilizes the embryo inside her to materialize a sword, which she uses to combat the summoned creatures and keep her brother in line. The siblings become suspicious when a recent surge of embryo outbreaks occurs at their school, leading them to believe someone on campus is intentionally causing the mutations.