If anyone is still interested, I've been able to locate the temple in question. It is the Taima-dera Temple in Nara (http://en.wikipedia.org/wiki/Taima-dera
) which is said to be quite unique because it belongs both to Shingon and Pure Land sects, priests from Shingon and Pure Land holding the office of chief priest in shifts. The temple is famous for housing an important Pure Land mandala.
I wonder what kind of initiations were given. I am very interested in all interactions between Tibetan and Japanese Buddhism.