Yuuta was 12-year-old boy, who had lost his father in the traffic accident one year ago. In the summer vacation, he visited a deserted dam deep in the mountains, where he had a good time with his father before. Suddenly a thunder storm occurred and he slipped on the ground. He lost consciousness and woke up to find a girl and an unfamiliar village. He time-traveled 30 years and reached a village, which sank at the bottom of the dam. This is Yuuta's precious memory of "another" summer vacation.

In this exhilarating series paying homage to classic 50s era science fiction, the disappearance of revolutionary G-Reaction engines is but the beginning of the ghastly end for mankind. While deranged alien forces prepare a fleet of flying saucers to the invasion of all invasions, teenage geniuses Penny Carter and Billy Kimura join forces with a clandestine secret alliance to save humanity from the extra-terrestrial helmet worms and their tentacles of doom! Avoiding alien attacks and dodging disintegration rays won't be easy, but these courageous kids will have help from above as Ace pilot James and his mentor Cpt. Clayton enter the fray to stave off a threat incomprehensible to mere mortals!

19-year-old Kubota is ready to find a girlfriend. The perfect chance arises when he meets Masana Fujisaka, his first love, in a club. She's just broken up with her longtime boyfriend and is surprised to run into Kubota, who sees that the perfect opportunity has just arisen.

Short episodes streamed on the anime's official site after every episode, giving background information about the show.