The film takes place in Australia and follows the Nohara family on an inexpensive and family-friendly honeymoon trip that Misae discovered. Instead of the romantic trip they envisioned, Misae, Hiroshi, and their children get wrapped up in a dangerous adventure. Hiroshi is the center of the story and becomes the key to a treasure. Hiroshi is taken away soon after the family's arrival in Australia. The remaining family members must rescue him while dealing with a mysterious masked group and treasure hunters.

[Source: Anime News Network]