Three high school students stumble into a forbidden room at their school and emerge in feudal Japan, right in the middle of one of history's most legendary battles. Coffy, Daniel, and their teacher Okehazama find themselves caught up in the chaos of the Battle of Okehazama, a pivotal moment that shaped the entire nation. The twist: their teacher has somehow become a soldier in the very conflict he teaches about in textbooks. What starts as a desperate scramble to survive turns into a comedy of errors as the modern teenagers try to make sense of ancient warfare while keeping their teacher alive. Their fumbling attempts at historical accuracy only seem to complicate matters, forcing them to grapple with whether they can change fate or if they're simply watching events unfold as they always have. This is a time-travel romp that blends slapstick humor with historical intrigue, asking what happens when ordinary people collide with extraordinary moments. Expect culture clashes, historical hijinks, and the kind of absurdist comedy that thrives when nobody knows what they're doing.