"Starry Sky" is an RPG game with a space background. The game recently launched its first DLC "Shattered Space", and Kubhi Fortress is an achievement of the DLC. To unlock Kushibi Fortress, you need to complete the "Kushibi Fortress" mission. Kushibi Fortress is the last mission in the DLC and can be completed by continuing to do the main story.
How to complete Kushibi Fortress
The game recently launched its first DLC "Shattered Space", and Kubhi Fortress is an achievement of the DLC.
To unlock Kushibi Fortress, you need to complete the "Kushibi Fortress" mission.
Kushibi Fortress is the last mission in the DLC and can be completed by continuing to do the main story.