Death classroom mein phansi hui girl genius Evelyn, accidentally ek dark love system activate kar leti hai. Sirf cold SSS-class ghost professor Gabriel ko continuously flirt aur provoke karke hi deadly rules ko kam kiya ja sakta hai. Lekin jaise jaise uski acting real feelings mein badalti hai, use pata chalta hai ki yeh monster jisse sab darte hain, asal mein ek victim hai jise academy ne 100 saal tak qaid aur use kiya hai.