Fireflies have come back to a river in Matsue-city, Shimane prefecture.
Spreading π-soil conditioner "Super AKANE"for seven years restored the environment of the river and realized the wonderful result.
50 members from all over Japan participated in the tour to enjoy the firefly and visit power spots of Izumo Oyashiro shrine and Hinomisaki.
A lecture explaining the importance of iron against global warming was a spice of the tour.

The story of returning fireflies to Matsue-city is introduced in "user's story 1."