My password is 'Password''s manga / #Bullying(44)

2 sisters made to save the world from raising of the demon king. However, the machine birthed 3 sisters. Now the plot thickens as they are separated when send to school to protect the students from vampires, however only two sisters can be given terrifying power help them defeat the vampires. Now throw into this betrayal, deception, friendship, bullying, blackmail, kidnapping, murders and Bam! you get an interesting plot!

The protagonist can see the people around her change from good to bad intrinsically, therefore lacks trust until she meets him...