Famous haiku poet Kobayashi Issa visited in 1795 and wrote about the temple's ancient cherry trees. These same trees, now 300 to 400 years old, still bloom every spring.

Kobo Daishi built a triangular fire altar here and performed rituals for 21 days. The altar's remains still exist as a small island in the temple's Triangular Pond, which is how the temple got its name.

Sankaku-ji é o Templo Nº 65 da Peregrinação de 88 Templos de Shikoku, situando-o na segunda metade da famosa rota.

The Yakushido hall is believed to cure warts and corns. Visitors dedicate votive tablets with octopus pictures, believing the octopus suckers will magically remove their corns.