Amy, Lily, and side characters like Alice, Samantha, and Aryn. General Progression Tips
In later versions (like 0.3.0+), these often require having multiple girls at max affection and desire, then talking to them about "the other girls" in the evening. Special Harem Class [Ongoing] - Version: 0.1.2
Use the INFO app on your in-game phone to track achievements, which serve as a guide for completing all available content. Amy, Lily, and side characters like Alice, Samantha,
Talk to Claire in her office or during school to get tips on date locations and character interests. Main Characters to Pursue and side characters like Alice
Usually requires reaching Affection 10 with at least one girl and completing her locker room scene, then visiting Claire in her office.