For any protagonist, you can trigger her first scene by talking to her when your EP is high and selecting the "......" option. If you're having trouble getting that, the easiest way to raise it is to step on the pink tiles in the later part of the sea/pool area. There's a section right by the emergency exit where you can walk back and forth to build it up. To get her second scene (and progress the story), you need to being playing as the Alumnus (default name is Mamoru), and it'll trigger automatically after the first one.Does anyone know how to trigger the fight with Mochizuki? I am having trouble with it. Please help