Delusional Yandere Jia is a horror romance simulation game where players get to experience a thrilling love story. Players role-play as the protagonist of the story. One day, one of his friends tells him that a cute girl named Jia is madly in love with him. Later, he finds Jia in his house cleaning for him, 'Do you know that we are engaged?' she asked. She is obviously a psycho! The protagonist called his friends to confirm Jia's identity. however, his friends told him Boa is the one who is madly in love with him, not Jia! Who is Jia? And what does she wants?