Shionoe Hot Spring on Shikoku for firefly?

We will be at Takamatsu in early July (5-7).
I was looking up things to do and found out there's a possibility of firefly sightings.
Anyone know anything about it?
It does not seem to have public transportation into the mountain.
We will not have an international license to drive, so two taxi? or private car rental with driver?
If it is firefly to see, it has to be late into the night. I am worried about coming back. Any suggestions?
Something worth doing? We have no access to firefly view places near home, California.
Thank you.

Too late.

Use Google translate.
http://www.jalan.net/news/article/83651/
This is Shionoe Hot Spring firefly fes 2017.
http://shionoe.jp/category/event/e-hotaru/

In that period already have to move mid/east/north Japan.
This is 2016 watching events list in nation wide.
http://www.rurubu.com/season/summer/hotaru/list.aspx?gf=1
http://www.rurubu.com/season/summer/hotaru/list.aspx?gf=1&p=2
http://www.rurubu.com/season/summer/hotaru/list.aspx?gf=1&p=3

Do you know why they flashing? (for what?)
Viewing events not so late.
And have to thinking Moon conditions.
http://www2s.biglobe.ne.jp/~yoss/moon/moon.html
In that week is not good if no/few clouds.
http://koyomi8.com/moonage.htm?cmd=20170709110
Late JUN better.
http://koyomi8.com/moonage.htm?cmd=20170609110
And don't forget Rainy Season calling "”~‰J/tsuyu".
(no heavy rains just falling longer a lot)