I'm writing a fanfiction story, and I'm considering a plot arc involving Tenshi. However, this plot point only works if Tenshi has already entered Heaven at this point (703 AD). Unfortunately, I can't determine when she and her family ascended.
The main lead I have at the moment is one of her profiles:
The Hinanawi clan used to be a family of priests who were tasked to protect their keystone, which kept earthquakes under control.
However, even with the Hinanawi keystone, earthquakes occurred rather often. They occurred so often that it went out of the hands of Oomura-no-Kami, a celestial who was in charge of earthquakes at that time, so the Nawi clan, who had been serving the celestials, was ordered to take over the job around the Gensokyo area.
The Nawi clan was a family of earthbound priests, but were enshrined as divine spirits after their death in a small shrine beside a mountain lake known as Nawi-no-Kami. The Nawi-no-Kami still watch quietly watch over Gensokyo.
There is a Nai Shrine in Shimo-hinachi in Nabari City that is for a god of earthquakes, so I think this is the key to the mystery. Unfortunately, that's as far as the trail leads for me. I've run into a dead end, and can't find any information on the Nai Shrine, much less when it was founded.
I'm stuck on that part of the start until I can confirm or deny Tenshi's presence in Heaven at that point. Is there anyone who could help? Part of my problem is that I'm not the best in Japanese. Any information would be helpful.