For years, Arlan and Sarah Calderon fretted over when to tell their daughter, Noriko, that she was different.
Dark-haired and olive-skinned, she looked indistinguishable from the children she walked to school with every day in Warabi, an everyman suburb of Saitama Prefecture. But unknown to her, Noriko's parents were illegal Filipino immigrants.
In July 2006, the then 11-year-old discovered the family's secret in the worst possible way when her mother was arrested for overstaying her visa.