To save her younger brother from bullies at his all-boys school, Mahiro, the older sister, disguises herself as a boy and infiltrates the school. She manages to stop the bullying by exploiting the bullies' weaknesses. However, once they discover Mahiro's true identity as a girl, she becomes the target of their revenge, enduring intense torment. Initially defiant, Mahiro gradually succumbs to the pleasure of being abused, losing herself in her lust and experiencing multiple orgasms.
