The Hissori Training Headquarters is built into a more secluded area within Sumidoru, found carved into the cave walls leaving only one pair of large double doors to show it's existence, however there are many other passageways out. A large facility with numerous rooms used for training. This building has no connection with assigning missions as the Shadows have their own building separate of this one.

This building has a storeroom that Hissori clansmen can find any supply needed for missions.

The final service this building offers are sleeping quarters.