Shizuka Mitsugo is the only daughter of the late Mitsugo financial conglomerate leader, Taizo Mitsugo. She inherited her father's will, who was once a great fighter and fought against evil as a vigilante, becoming Sexy Mask. One day, after a fierce battle with a popular monster from the secret society of evil, Ego, Sexy Mask sustained near-fatal injuries and was rushed to an emergency hospital. However, when Shizuka woke up, she had fragmented memory loss. Moreover, that hospital was secretly connected to Ego and was a facility for modifying inpatients! The claws of evil close in on Sexy Mask again! [BAD END].
