Kazuhito is caught in a trap and captured. When he regains consciousness, he finds himself in his room at Sumitani Hall, wrapped in a mat and accompanied by Madoka... who appears to be acting strangely... Could Madoka be the killer behind the slasher incident?! Before long, Natsuno saves Kazuhito before he is forced to taste fear, but...
For that person to be
 my very own sister...
Und dann ist es auch noch meine Schwester!
Y que sea mi hermana.
E ainda é a minha irmã...