The Justice Social Link, or Treasurer Social Link, is one of the many bonds you can make in Persona 3 Reload by befriending other students in your class. This one revolves around the initially shy Chihiro Fushimi and her eventual growth.
Persona 3 Reload Justice Social Link Guide (P3R)
Justice can be started on 5/23 at its earliest. After starting the Emperor Social Link automatically on 4/27, you can occasionally speak with Chihiro next to the Student Council Room on Tuesdays, Thursdays and Saturdays. Speak with her on three separate days using the following answers during each of them: