Schoolgirl Tsuchiya Shizuka is captured by Don Sphinx and cursed by Satan to carry a monster within her body. However, her latent power awakens, transforming her into Sailor Silence—the warrior symbolizing silence and compassion. With this power, she manages to overcome the dire situation. Yet the curse remains only partially broken, forcing her to continue fighting in an incomplete state. Once again cornered by Don Sphinx's assassin, Harideimon, she is also attacked by the demonic beast Kibadeimon. Outnumbered two to one, Sailor Silence suffers severe wounds from Harideimon's powerful assaults and Kibadeimon's sharp fangs and claws, her agony intensified by a blood-sucking machine and thick iron spikes. This battle becomes a grueling trial that tests both her strength and resolve.