Typically unlocks around Day 13 after reading a headline in The Daily Carrot about Bobo and Rosemary.
Upgrades Tsuki's two-floor treehouse to a three-floor layout.
Click the mailbox, select "Express Delivery," and enter a valid code (e.g., seasonal codes like easterbunny have provided up to 1,000 free carrots). 🏡 Unlocking Premium Content (Homecoming)