If you are invited to Cha no Yu by a Japanese friend, it will be a big chance of your experiencing the most profound Traditional Japanese culture.
CHA NO YU is a good introduction for a complete stranger. Tea Hyakka is literally an encyclopedia of Tea Ceremony and surely enhance your knowledge about this special ceremony of the spiritual exchange between the host and the guests through serving tea.
Your academic quest will be satisfied by An Anthropological Perspective on the Japanese Tea Ceremony.
URASENKE is a school which was perfected by Rikyu Sen and ENSHU-Ryu was enhanced by Enshu Kobori and has been popular among the Samurai class.
All the Web sites above mentioned are essentially bilingual. If you, however, find any difficulty in Japanese language, please consult a Japanese-English Dictionary.
Any comments appreciated.