Walkthrough High Acting

Move to the Ballet Twins and look for Mark at the entrance to the subway, below, at Meowcello. Talk to him a few times, after which you will be asked to go to the cavern.

Script Draft

Move to the video rental store and launch the "Script Draft" combat order. You need to run along the obstacle course without falling into traps. Use RMB to dodge through laser beams and other traps. You are not limited by time! If you miss 5 hits, you will have to start over. In the morning, Mark will come to the video rental store. Just talk to him.

Strong Acting School

Return to the Ballet Twins after some time, Mark will be marked again. Talk to him, go to Banbu Gilza nearby, return to Mark. Follow to the rental store and select the "Strong Acting School" combat order. Go up and kill the Ethereals, avoiding any damage. In fact, as far as I can tell, the damage from the first three Ethereals does not count. When you go up, an invulnerable Ethereal will appear. Run past the traps, dodge them with RMB, break the boxes and interact with the terminals. You will have to activate two terminals. The second terminal will be surrounded by lasers, so use dodges. Talk to the Wandering Banbu. Mark will appear in the video rental store. Talk to him. You can get the medal from Meowchello.