Akabane Yuu (Nana Komatsu) is a very ordinary female high school student. Due to her father's work, Yuu needs to live in a dormitory and start living with other classmates. On weekdays, Yuu is introverted and taciturn. She hopes that this dormitory life can help her change her introverted personality. However, not long after Yuu moved into the dormitory, she provoked the famous "black devil" Kurosaki Haruto (Kento Nakajima) in the school. Under a strange combination of circumstances, Yuu turned into a puppet at Haruto's disposal. What makes Yuu feel headache is that Haruto seems to like to play tricks on her. If Yuu is a black devil, then Shirakawa (Yudai Chiba) is the gentle prince charming in Yuu's mind, but as time goes by, Yuu finds that the relationship between him and Haruto has changed subtly.