In a quiet Tokyo suburb, a family of tiny people called the Little Ones live hidden in a forgotten library. They survive on a single drop of milk served in a beautiful blue glass each night, a tradition upheld by a human child from the family who owns the house. When World War II erupts and the human family is evacuated, the Little Ones are left to fend for themselves, facing starvation and danger. This magical yet poignant story follows their struggle for survival and explores the fragile bonds between different worlds during a time of great upheaval.