Ever since she was a child, Saori(Kurugi) has had an inferiority complex towards her older sister Ayaka (Orikasa), who is beautiful, has a good personality, and is well-liked by everyone. Now that she lives away from her sister, her life has become rough, and she lives a self-indulgent life with her boyfriend, Katsu, who she happens to be living with. One day, when Saori tells Saori that she is engaged to her, she becomes enraged at the difference in their circumstances, and she turns the blade of her twisted emotions against Ayaka...