Board Thread:General Discussion/@comment-26458056-20190313165609/@comment-34343339-20190314005322

B41 is one of the hardest non-5-5 quests in the game. All you can do is keep trying until you get to the boss and then hope for the S-rank. Are the 20.3 (No.3) guns on Furutaka and Kako upgraded at all? If they aren't, you might consider putting 20.3 (No.2) guns on them for the synergy stat bonus if you have them.

Other than that, just keep running the map until you win. Completing the quest chain and unlocking LBAS for World 6 is totally worth it. Good luck.