Kisaragi Rei (如月零)

Rei, the only child of the Kisaragi family and the protagonist's cousin. Since she was often exposed to the political conflict between groups from her young age with her relatives, she's not friendly with people other than close friends. In order to avoid unnecessary troubles, rarely going out and often spends her time at the House of the Kisaragi family called "Karakuri mansion in the back of the forest".