The ONTOHSAI festival in Suwa Taisha Shinto shrine held on April 15, 2007 in Suwa Taisha Shinto shrine in Suwa, Nagano prefecture, Japan.
Suwa Taisha is one of the oldest Shinto shrines in Japan and has the history of more than 1300 years.
I uploaded the video in YouTube. This maybe the first video on the festival appeared in internet.
Some people says that some traditional ceremonies in Suwa Taisha come from the Ten Lost Tribes of Israel came to ancient Japan. AMISHAV is the Israeli organization to search for the ten lost tribes of Israel and they also started to study the Suwa matter.