Monitor your sister’s health closely. If her health drops too low (especially during "adventure" segments), the journey can end abruptly.

Consistently choose options that build trust and maintain a high reputation with your sister.

Once you have a feather bed, always cook for your sister to maintain her health and stats.

Success in the game requires balancing "healthy" daytime activities with nighttime interactions.

Time management, relationship building, and status tracking (energy, health, and mood). Gameplay Mechanics: Managing the 30 Days

If you are playing on a higher difficulty, the stakes are much higher:

If your starting points are low, you will need to spend more time grinding, but it is still possible to succeed.