The protagonist, a female university student, time slip back to Edo near the end of the Bakumatsu era and encounters Takasugi Shinsaku and Kusaka Genzui, members of the Choshu clan, by coincidence. Her days with them are lively and pleasant. The circumstances around Japan, on the other hand, are growing increasingly aggressive. She begins to look for something she can do after being inspired by Takasugi and others who are deeply concerned about the country. What is the answer she comes up with after struggling and worrying in the era of the end of the Tokugawa Shogunate, which is vastly different from the present day?