S1.E4 ∙ Watanuki Family's Sea Cucumber

Soldier Klaus von Wolfstadt becomes a knight to enemy commander Taki Reizen, leading to a strong romantic bond tested by conflicts.

The Japanese AEGIS Destroyer "Mirai" of the Japanese Maritime Self Defense Force is on its way to Pearl Harbor for training missions when it's suddenly engulfed in a strange electrical storm.

A psychic orphan is taken in by the powerful Taira Clan. Unfortunately, what she predicts is a future filled with violence and civil war.

Three aviation focused war stories of Axis participants.

Taking place in the year 1937 on the eve of World War II, the story involves a mysterious spy training organization known as the "D Agency." The organization is established by Lieutenant Colonel Yuuki from the Imperial Japanese Army. His ideals lead him to recruit people beyond military academy graduates and personnel, while training them to become skilled agents in arts of manipulation. These agents would become a specialized team to conduct operations. One such antihero agent, under the name Jirou Gamou, goes on a harrowing mission to uncover secret documents titled "Black Notes," while battling forces from within and without his own ranks.