Fifteen summer vacationers discover a reclusive individual living in a coastal cave with cutting-edge technology. He introduces them to a virtual reality game where 15 giant robots safeguard the planet against extraterrestrial threats. Initially enthralled, the kids become trapped in a harrowing experience after an unforeseen event unfolds. With no escape in sight, they must brave treacherous terrain and find a way to survive before time expires.

Bokura no
A group of 15 kids discover a secretive individual dwelling in a hidden coastal cave, where they find themselves immersed in a futuristic world of advanced technology.