What happened to the mom? Does the dad die at the end or did she just stumbling upon his r...

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The mom went missing in a boat accident, and was presumed dead. The father fell into a coma after getting into an accident at his warehouse job (he was crushed by a huge stack of magazines). He does wake up after about a year, however. Hime was given the key by a family member, and that's how she finds the warehouse.