In Rome in the year 128 AD, a Roman named Lucius Modestus is having trouble coming up with ideas for architecture. While contemplating in a bathhouse, he discovers a strange drain than sends him to a bathhouse in Modern Japan. While confused by his surroundings, he becomes amazed by some of their innovations, such as fruit flavored milk. Taking these ideas back to Rome, he incorporates these ideas into his grandfather's bathhouse with successful results. However, the old bathhouse where he slipped is closed.