The story takes place in the Bakumatsu era in Kyoto. A solider who has lost his memories is aided by the famous Shinsengumi member Sōji Okita. Sōji Okita names this man "Junsuke Tachikawa." Junsuke's life begins anew amidst the Mibu soldiers.
Pope Pius XII, the man who led the Church through WWII, has been maligned by history as the Pope that could have stood against Hitler, but remained silent. Recent archival revelations, however, tell a different story. What is the truth? How did he respond to the Nazi threat? And who told his story?