One morning, Subaru Natsuki finds himself in a strange room facing two girls, the sisters Rem and Ram, known for their synchronized speech. His banter with the sisters is cut short by Emilia, the girl he sacrificed his life multiple times to save using his unique ability 'Return By Death.' Emilia reveals that she brought him to her mansion after he was injured defending her. In the mansion, Subaru meets Roswaal L. Mathers, the eccentric owner. Requesting to work as a butler with Rem and Ram, Subaru's wish is swiftly granted by Roswaal. As Subaru settles into his new role, a sense of déjà vu hits him as he wakes up once more at the mansion's doorstep, trapped in a time loop. Determined to uncover the truth behind his strange power, Subaru faces the daunting challenge of solving the mystery before losing himself to despair.