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Upon arrival, they were subjected to full-body scans, strip searches and forced to wear green prison jumpsuits, German outlet Ostee Zeitung reports. They were then placed in a holding facility with serious criminals, including an alleged murderer who had been locked up for 18 years, and were forced to spend the night in a freezing cold double cell.

"It was all like a fever dream," Maria told the German outlet. "It was a shock; we didn't expect it. We had already noticed a little bit about what was going on in the U.S. But at the time, we didn't think it was happening to Germans. That was perhaps very naive. We felt so small and powerless."

After a sleepless night in the freezing cell, the girls were woken early and escorted back to the airport in handcuffs. Upon arrival, they were forced to board a Hawaiian Airlines flight to Tokyo and were told they would receive their passports back once they arrived in Japan.

Included in their travel documents were interrogation transcripts signed by the girls, which "contained sentences we didn't actually say," said Charlotte after the ordeal. "They twisted it to make it seem as if we admitted that we wanted to work illegally in the US."