Mizuki Tsujimura’s Lonely Castle in the Mirror is a stand-alone portal fantasy novel. Originally published in 2017 as Kagami No Koji, Phillip Gabriel’s English translation came out in 2020.
Kokoro Anzai has been the target of mass bullying at school1. Rightfully dubious of the school’s ability and willingness to protect her, she has arrived at a simple but effective countermeasure. She refuses to attend school; she won’t even leave her house. Aware that their daughter is skipping school but not understanding why, her parents find her a new school. Kokoro confounds their efforts. Anything outside her house has become too frightening.
Respite comes from her mirror.