Something strange is happening at her school. Fa finds that someone is behind all these incidents, and it just so happens that there’s a new biology teacher named Ajin.

Ajin and Fa are certain that the culprit is someone in this school and start investigating. But then something unexpected happens on Revision Day before the exam.

Fa is being attacked by the culprit in the glass mask, and thus Fa and Ajin meet the culprit for the first time.

Namsine is preparing her last revenge at school, while Ajin rushes to save Fa, without realizing that Enigma is planning something for him, too.