After the previous accident, Mariu, a summoned bishoujo who suffered a fatal injury and lost her memory, became interested in the word "erotic." Her interactions with her senior gave Mariu a glimmer of hope. To activate her cells, she shared magical energy with her senior through sex. The forbidden ritual, battling fate by tracing history, weaves the future of the last human master and their servant through eroticism, marking the beginning of their story...
