Thermae Romae Collection

The story follows a Roman architect named Lucius, who is having trouble coming up with ideas. One day, he discovers a hidden tunnel underneath a spa that leads him to a modern Japanese bath house. Inspired by the innovations found there, he creates his own spa, Roma Thermae, bringing in the modern ideas to his time.

A sequel to the comedy Thermae Romae, an adaptation of Yamazaki Mari's popular comic. A Roman Empire bathhouse architect learns how to travel through time when in need of inspiration. Then, a conflict could divide the Roman Empire.