Minako is at the age where her father is more like an alien to her than a person. The situation is exacerbated when he comes home drunk one night and tries to climb on top of her. Minako's mother deserted them for another man when Minako was a child. Now working as a hostess, she has little time for her own six year-old daughter, Yu, Minako's half sister. Both girls are yearning for their mother's love. Minako runs into Yu at a game center in the mall and proposes they take a trip. She changes out of her school uniform and into adult clothes and the pair hops on an overnight bus out of the city.

A young boy in a peaceful seaside town gets more than he bargained for when he takes home a mysterious egg. When it hatches, out comes a baby turtle that grows into a new version of Gamera. But will it become powerful enough in time to defeat the rampaging monster Zedus?

A biopic based on the production of Daiei's Giant Horde Beast Nezura, the scrapped precursor to Gamera.