Moto Dorei desu ga, Oni no Dorei wo Kattemitara Seiryoku ga Tsuyosugiru node Sutetai......

Seven years have passed since Sora Ono was forcibly taken to a different world, where she was enslaved. However, due to a clerical error, her "slave" status was unexpectedly revoked, and Sora regained her freedom. She now lives as an ordinary citizen, though the memories of her past remain. Despite her newfound freedom, Sora still struggles to cope with the trauma of her past. She has become numb to emotions and has a hard time forming connections with others. However, her life takes an unexpected turn when she decides to purchase a slave, an "Oni" - a powerful and intimidating being from another world. The Oni's immense strength and abilities are matched only by its arrogance and disdain for its owner. Sora's decision to buy an Oni is motivated by a desire to alleviate her own feelings of weakness and emptiness. She hopes that having an Oni as her slave will give her a sense of purpose and make her feel more powerful. However, this decision sets off a chain of events that will challenge her perceptions of herself and her relationships with others, forcing her to confront the darkness of her own past and the true nature of her new companion.