The giant monster Raiga returns, rising in Atami Harbor and attacking the city. A second kaiju, Ohga, soon joins the chaos, and the two monsters clash, destroying large sections of the city. Defense forces launch two new weapons, the giant tank Kamikaze and the drill tank Gokumei, to meet the the monster invasion head on. But as the beasts work their way to Tokyo, will they be enough to stop the monsters from laying waste to the city?
Riko, who will begin university in Tokyo in spring, journeys there from Hiroshima in February with her father to find a place for her to live. On their travels, they meet various colorful characters. The father remembers his late wife, and raising his daughter alone. Their fun time together is tinged with the knowledge that it is about to end. Rakugo performer Kyotaro Yanagiya appears in his first leading film role, and rising star Anna Ishii plays the sensitive Riko. The eccentric supporting cast includes Romi Park, Akihiro Kakuta, Keiko Yanagawa, Kei Ishibashi, LaSalle Ishii, and Momiji Yamamura.