Lucius, a Roman architect, is transported through time to modern-day Japan, where he learns about Japanese bathhouses and uses this to his gain back home.

Ancient Roman architect Lucius is too serious. His inability to keep up with the fast-moving times costs him his job. When a friend takes the dejected Lucius to the public bathhouse to cheer him up, Lucius accidentally slips through time and resurfaces in a modern-day public bath in Japan. There, he meets aspiring young manga artist Mami, along with others of the "flat-faced clan". Shocked by the many inventive aspects of Japan's bathing culture, Lucius returns to ancient Rome and garners tremendous attention when he implements these novel ideas back in Rome. As he time-slips back and forth between ancient Rome and modern-day Japan, Lucius' reputation as the ingenious, new bath architect begins to grow.—Production

In ancient Rome, architect Lucius (Hiroshi Abe) is too rigid in his ways and unable to keep up with the fast changing times. Because of this, Lucius loses his job. A friend then takes Lucius to a bath house to cheer him up. There at the bath house, Lucius slips through a time portal and arrives at a bath house in present day Japan.—AsianWiki