In the town of Saima, when summer is about to begin, a group of six high school students intend to live a secret adventure by spending seven carefree days in a ruined mining facility.
After finally passing his teacher's exam, Miwa (Yukiyoshi Ozawa) devoted himself to teaching in a rustic primary school. He struggles to get through to his students, until he creates a class project to raise fireflies to fly over it once again. All students, even the reserved girl Hikari (Risako Sugaya), become passionately involved in the project. However, it brings them into conflict with parents and the school, one problem after another stands in his way.
Into the bully-infested home room class struts a fearless, ceramic-masked student. Squarely confronting a gang of ruffians, it is soon discovered that behind the mask is none other than Danta, an otherwise weakling student who has heretofore been picked on relentlessly by these same bullies. Donned with his mask, however, Danta exhibits a totally other personality, lacking fear and intimidation. The other students, looking on, soon experiment with the power of masks and find to their glee that behind a facade of anonymity, they experience an overwhelming power to act without the confines of self-consciousness.
A community is in turmoil when junior high schoolers barricade themselves in an empty factory to protest the draconian rules of parents and teachers. They're sick of heavy-handed teachers and iron-fisted parents. And now they're going to do something about it.
