Thermae Romae: Kodai Romajin ga Uchuu e

Bonus episode included with the BD/DVD.

The story is a comedy about Lucius, an architect of public bath houses in ancient Rome, who time-travels to various modern-day baths in Japan. The author explores the two cultures in the world "that have loved baths the most: the Japanese and the Romans."

Lucius ends up at the presentation of bathroom and toilet equipment by Japanese toilet manufacturer TOTO, where he learns about the most recent technological advances in that field.

Lucius, a bath designer in the Roman Empire, accidentally slips back in time to present day Japan and learns about Japanese bath culture in this comedy.