By 
Blue Protocol Chapter 4 appeared in the 1.02.000 update. The new chapter introduces the West Bernhard Peninsula, adds a new Main Quest, and raises the level cap from 50 to 60 and Class Action and Normal Attack Levels from 3 to 4.
Other type of additional quests added with the update include 64 new sub quests, 7 character quests, 3 event quests, 9 challenge quests, and 2 bonus quests. In order to access Chapter 4, the previous Chapter 3 of the Main Quest must be completed. New Gold and Silver Nappo headwear can be obtained, by encountering Gold and Silver Nappos under certain circumstances.
The new Main Quest introduced with Chapter 4 is called “Ken wa Dare ga Tame ni,” which translates to “For Whom the Sword is Worth.” The story of Chapter 4 of Blue Protocol involves the assassination of Duke of Bernhardt. The blame for this crime lies on Carvain, a knight of the Bernhardt Order.
The Bapharian oracle Einrain seems to be conspiring against the Duchy alongside Avaritia, and manipulating Carvain into taking the blame. Both Carvain and Einrain have been apprehended and taken into custody. However, Carvain denies his participation and seeks to clear his name. The protagonist will travel to the Duchy to rescue and assist Carvain.
Blue Protocol is currently available in Japan for PC, and Chapter 4 is now available. The PS5 and Xbox Series X versions of Blue Protocol will appear on Winter 2023 in Japan. The game will release worldwide in 2024.
