Chiisaki yusha-tachi: Gamera (2006)

Director: Ryuta Tasaki
Cast: Kaho, Kanji Tsuda, Kaoru Okunuki, Megumi Kobayashi, Ryo Tomioka, Shingo Ishikawa, Shogo Narita, Susumu Terajima

Synopsis:

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?