Shusekiji (出石寺) is bekkaku temple 7 of the Shikoku Pilgrimage. It is located in Ozu, Ehime Prefecture.
For me the most beautiful temple on the whole henro road. The view down to the valley and to the sea on the other side is particularly beautiful. If you have just one extra day, go here.
If I understood the temple staff right there is a hostel on the premises. I am not sure how to use it though, suggest to phone ahead.