In a zany comedy revolving around a bomb mishap, the Nohara Family's heartfelt bond with their dog Shiro takes center stage. This musical film weaves in catchy songs as the family embarks on a trip to Okinawa, only to have a peculiar flying saucer-like object cling to Shiro's rear end. Unbeknownst to them, this odd attachment is a dangerous bomb created by the mischievous 'Only Buttocks Aliens,' capable of obliterating the entire planet. As the space surveillance agency 'UNTI' steps in to defuse the situation, they face interference from the all-female terrorist group 'Hinageshi Opera Company,' adding chaos to their mission.