Read manga: I'm A Former Slave, But I Tried To Buy An Oni Slave Who I Later Found To Have Too Much Energy So I Want To Throw Him Away...

manga
Summary:

Sora Ono was sent to another world, where she became a slave.Soon after, a clerical mistake caused her “slave” status to be revoked, and Sora walks away a free woman.Then one day, she purchases a slave...