Charles and the captain absolutely won't allow us to do a live performance until development is finished!

Charles and the captain's relationship is going smoothly. Around that time, joint training with a neighboring country's knight order was decided. The captain said, "Don't you dare let those guys look down on us." So Charles challenges the neighboring country's knight order captain, who had made fun of his beloved captain, to a duel. What is the nature of the match, and what will be its outcome—Oh? The captain's condition is... A sequel where Charles's cry of "Captain, go to sleep!" echoes in vain. ※This is full-on BL. Please refrain from reading if it's not to your taste.