The supreme BOSS of the eerie world turns out to be a little girl?! The final battlefield of the war between the eerie realm and the human world has transformed into a rule-based supernatural entity named Mengmeng. The system's survival game randomly sends humans into the eerie realm to complete missions in exchange for the right to keep living. Mengmeng possesses her own domain and the ability to freely add, delete, and modify rules. Through her encounters with human players, she develops a longing for a home. Leaving her domain behind, she sets out on a journey through the eerie realm to find neighbors, family, and friends, gradually building a home of her own.