As an unexpected typhoon bears down on a small tropical island, a group of students trapped at school find themselves forced to put aside their personal issues and work together. Not only to save themselves, but possibly the lives of everyone on the planet!
While the title suggests a story of simple, everyday school life, the contents are more the opposite. The setting is a strange school where you may see the principal wrestle a deer or a robot's arm hide a rollcake. However there are still normal stories, like making a card castle or taking a test you didn't study for.
Peace returns to Edo Castle's Ooku, but ominous signs persist. The Medicine Seller uncovers the origins of a deadly conspiracy rooted in a 150-year-old secret involving the Ooku's creation, ancient grudges, and hidden truths. He faces the powerful serpent god, embodying the Ooku's dark history, risking everything to stop it.