In the far future, the heroine Hiyori Sena is kidnapped along with nine others, to a place called “Arcadia”. It is also known as the “Parallel Universe Broadcast”. There, a mysterious masked man introduces himself. In order to escape, everyone is forced to participate in dramas while figuring out who the traitor is among them.
In the 1920’s of Italy in a city called Burlone, the heroine Liliana is an orphaned girl who lives at a church with other orphans and a nun named Sophia. She also has a mysterious mark on her chest but has no idea why its there or what it means. She often leaves to go shopping outside the church but only stays in the “safe” area where the mafia groups agreed to not start any fights there. The parts of Italy is essentially “ruled” by different mafia groups called the Falzone, Viscounti, and Laoshu. Arc is the safest district while Vereno and Strano areas are dangerous.