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?

Hiroshi, a 30 year-old businessman, has traveled back in time 20 years. He encounters Kazumi, a young woman who was gravely ill. Hiroshi regarded this as an opportunity to help the young woman from his past, the memory of whom he had always cherished.