Retired university professor Gisuke Watanabe lives a comfortable but secluded life of affluence in the traditional Japanese house built by his grandfather. One day, an anonymous email threatens his peaceful lifestyle.

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.

Love and marriage are the issues when one bickering couple can't quite split up, but another seemingly happy couple wonders if they really are.