Tokyo was once known as the "city of water," but many of its rivers and waterways are now hidden from view. This time on Japanology Plus, we look at water in Japan's capital from various angles. Master brewer Shunichi Saito explains how tap water is used to make excellent sake. Tour guide Masahiro Inagaki takes us on a river cruise. And pleasure boat operator Ken Ito explains how land reclamation changed the face of water-based industries in the Tokyo Bay.

Tokyo is an energetic, bustling metropolis. But take a few steps off the main streets, and it reveals a different side to its character. This time on Japanology Plus, we explore the backstreets and alleys of Japan's capital city. Satoshi Okamoto shows us secrets and shortcuts in Ginza. Akiko Shiihara explains how alleys have turned Yanaka into an unexpected tourist hotspot. And Hidekichi Mizuno tells us how he started his alleyway business career -- by selling tangerines on the street.

Karakuri-ningyo, or mechanical dolls, can be regarded as traditional robots. Their technology is not just interesting but actually useful even today. This time on Japanology Plus, our theme is mechanical dolls. Our guest is Yoshikazu Suematsu, a visiting professor at the Aichi Institute of Technology who introduces us to the fascinating technology behind these dolls. And in Plus One, Matt Alt learns how to operate festival float dolls with local students who are carrying on the tradition.

In Japan, the bath has a special status. And for Japanese, using one is an essential part of daily life. It's not just a place to wash yourself, but a chance to relax, reflect on your day, or spend time with your family. This time on Japanology Plus, our theme is bathrooms. Our guest is Osamu Oba, a professor at Kyoto Prefectural University. He explains why baths are so important in Japan, and introduces us to the latest innovations. And in Plus One, Matt Alt discovers how bath additives are created.

Japan's paper money incorporates some of the most advanced security features in the world, including pin-sharp watermarks, and microscopic text. This time on Japanology Plus, our theme is banknotes. Researcher Takashi Uemura, a former employee of what is now known as the National Printing Bureau, tells us why cash is still the payment method of choice for most Japanese shoppers. And in Plus One, Matt Alt learns about the elaborate envelopes that are used to gift money on special occasions.

There are over 90,000 cleaning establishments in Japan, and a huge number of Japanese use them regularly. Innovative machinery makes the process cheap and efficient. Stubborn stains are removed by masters of their craft. This time, our theme is laundry services. Our guest is Suzuki Kazuyuki, the third-generation owner of a Fukushima laundry business. He takes us behind the scenes at an industrial laundry plant. And in Plus One, David McMahon investigates a modern "coin laundry."

Over the centuries, Japan has suffered from repeated outbreaks of diseases like smallpox, measles and cholera. Where did the people of the past think these epidemics came from? And how did they cope? Our theme this time is Japan vs. Epidemics. Our main guest is Yamamoto Satomi, an art historian. She explains historical attitudes to disease by examining works of art, and the characters they feature. We also take a look at a contemporary social media trend.

Aloha shirts are popular symbols of Hawaii, worn by tourists and Hawaiians alike. A look back at their history reveals a Japanese connection -- they were often made by people of Japanese descent, using materials and techniques from kimono making. This time on Japanology Plus, our theme is aloha shirts. Our main guest, Nakano Yoshihiro, has worked with the garments for over 20 years. He goes into detail about the contribution Japanese made to their origin and development.

In a Japanophiles interview, Peter Barakan meets Chad Mullane, a comedian from Perth, Australia. Chad talks about Japanese comedy, and explains how he fell in love with it. We see some of his routines, and learn just how much hard work it took to become a professional in the industry. We also meet Tea Kato, Chad's long-term comedy partner, and Bonchi Osamu, a veteran performer who took Chad under his wing.