Nagi Mamiya, the daughter of a noble family, runs away from home to escape her family's forced political marriage after her father's death. However, with no one to turn to, she has nowhere to go and visits her former teacher's house... A lonely young girl who can't turn to anyone for help, eventually loses her mind due to her hellish confinement and lesbian training... A story of two isolated women with emotional scars... a story of a closeted lesbian's confinement.