第3話: 劇場でキリコに監視される中、ユイは脅迫状を受け取ったことで黒幕に狙われる

3

Yui receives a threatening letter and later becomes the target of blackmail. Kiriko follows Yui and Sayoko to the theater. However, the real target of the Skull Man is Sayoko, who turns out to be a mutant. (Source: Wikipedia)