Since childhood, Sayori (Kuzuki) has harbored an inferiority complex towards her sister Ayaka (Orikasa), who is both beautiful and kind, making her popular with everyone. Now living apart from her sister, Sayori's life has become reckless, and she has ended up cohabiting with Katsu, leading a self-destructive lifestyle. One day, when Sayori receives news of Ayaka's engagement, she becomes enraged by the difference in their circumstances and directs her twisted emotions like a blade towards Ayaka...
