In Lost Judgment you can obtain The Body Model Walks at Night!!! side case by opening your phone and looking in the Buzz Researcher for mention of the Body Model in Chapter 3. Make your way to Seiryo High School (at night) and approach the main entrance to trigger a cutscene. You’ll then need to search the area for the roaming Body Model. Follow the objective on 1F to trigger a brief cutscene. On 2F look in room 2-5 to find the Body Model crouched in the corner. Use the Noise Amp to examine the Body Model, which will trigger a cutscene. A chase will ensue following the cutscene. When you catch the culprit, you’ll need to speak with Naito again. Progress in the story until it turns day (Chapter 4) then head to the Seiryo High School Cafeteria on 1F. A cutscene will trigger and the case will close.