The Nohara family teams up with the Onsen G-Men, a government agency responsible for Japan's hot springs, to take on Yuzame, a terrorist group that seeks to eradicate all hot springs in the country. The conflict escalates into a final battle that takes place at a hot spring resort. Shin-chan, along with the Noharas and the Onsen G-Men, must thwart Yuzame's plans to destroy Japan's hot springs.