If you are running into specific errors (like a missing .dll file), checking community hubs is your best bet:
Since this is a visual novel with multiple endings based on your choices, a walkthrough is the most helpful tool. Onee-san_to_Amaero_Milk_Kissa.7z
Files ending in .7z are compressed archives. To access the contents safely: If you are running into specific errors (like a missing
: This is the gold standard for Japanese visual novel guides. While the site is in Japanese, you can easily use browser translation to follow the choice trees for specific character routes. Onee-san_to_Amaero_Milk_Kissa.7z