You could find a nice review of Akai Hana on Trevor brown 's Website. Thanks Trevor.
As Trevor states, interrest in Shibari in Japan has constantly decreased since years but fortunately SM Snipper, the major magazine is still alive with Yasuji Watanabe himself has a long time chief editor. SM Snipper is published monthly and mix the "worst" in SM bondage with the very best, as Araki has a monthly column there for years. I was first introduced to Yasuji photo work through SM Snipper as Amida 7 a collectiv he was doing with my good friend Mika and M. Fukuda. Part of the photos are in Yasuji's book Tokyo Girl.

The excellent Yasuji Watanabe's photoblog can be seen here

These photo are not by Yasuji but shot by myself at a rare Kinbaku private session i was invited to by Yukimiura sensei a couple of years ago in Golden Gai, Tokyo.
The left girl is sumire, the fourth model of Akai Hana.