To fill your CG gallery, focus on identifying which location triggers a character's unique scene at specific times of the day.
Always talk to the heroines in shared spaces like the kitchen or living room to unlock new dialogue options or locations. Technical Setup
Certain events are prerequisites for others. You must "secure" early events to progress through a character’s storyline. Character Progression Guide
Success in the game depends on choosing the correct "location" within the sweet home to trigger specific events, rather than just clicking on a character's icon.
In similar roommate-themed games, you can often unlock new areas like an office by interacting with characters in common areas, such as the kitchen.