Yuka Endou and Sailor Volcano continue to fight against demons. - The demon witch Gerrea, who hates her, finds out that Yuka is in love with her teacher, Kento Tachibana, and seduces Tachibana by disguising herself as her colleague teacher, Himuro. - Shaken after witnessing the two of them meeting, Sailor Volcano sets out to fight the youma and finds out that the Himuro who appeared there is the witch Gerrea. - With Tachibana taken hostage by Gerulea, Sailor Volcano is unable to resist and is beaten by a demon and faints. - In order to destroy the body and mind of the Sailor Volcano she captured, Gelrea teased her in front of Tachibana, and made Tachibana become her demon Gerhardt. - [BAD END]