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With Regina's job in Japan nearing its close, she is at a loss at what to do next, while also struggling with trying to reconcile the love for her parents with their poor life choices. After going on a trip with Yuuta's sisters to a new underground shopping mall, a fire breaks out and causes a collapse, damaging the computer system and trapping everyone inside. Regina, with her computer knowledge, is the only one who can hack into the system to open the doors to allow the Brave Police inside to rescue everyone.