Nioh 2: All Usura-Hicho Locations

Nioh 2 Hidden Hopes Trophy Guide - Encountered all the Usura-Hicho in "The Frenzied Blaze". [Bronze]

This takes place in Main Mission 11: The Frenzied Blaze. During this mission there are 3 swarms of butterflies you can interact with. They are glowing blue and stand out from the rest of the environment.
Here are their locations:

1) In the first Dark Realm area.

2) After the 2nd Shrine, in a side area before talking to the samurai that joins your team.

3) In a side area to the right just a few steps before the 3rd shrine (last Dark Realm before the mission boss).