Saori Sato is the new Schoolgirl Supervisor of Sayama Academy, an elite all-girls school. She is prepared to start her first shift after settling in with her belongings and gear for patrolling the halls, all while living life as a regular schoolgirl as well. It’s her first day as a supervisor and student, and she’s just finished settling in and is ready to start. She’s monitoring the hall in Building B, 2nd floor, and decides to check one of the locked doors. As a supervisor, she uses her level 1 keycard to unlock the door.