Set in the year 1868, Imperial statesman Katsu Kaishuu attempts to avoid a futile conflict with Shogunate forces by sending a message to the highly influential samurai Saigou Takamori. One day, Katsu crosses paths with a high school student named Masaya and a history teacher named Mikako who have slipped back in time from the future. Mikako is attempting to find two other students, Eri and Shintaro, who may have also slipped
