[Machine Translation] The year is 158 A.D., and the Roman Empire is in the 20th year of the reign of Emperor Antoninus Pius. Lucius, a Roman bathhouse designer, is approaching his 60th birthday and is suffering from back pain, his wife Satsuki has mysteriously disappeared, and he and his son Marius are having parent-child discord. The key to the solution lies in Japan's "Onsen" hot springs...?