Tsubasa Otomiya

In a world where the dead walk, where good and evil exist as palpable forces, a darkness is stirring. The undead march against the cities of light, to capture the sacred fire that is the source of their power. But one hope remains. Called into this world by the magical flame, a young girl named Himiko is thrust into the maelstrom of danger, betrayal, and war. For she is heir to the sacred fire, and holds a power that could save its Guardians... if she survives! (Source: Central Park Media)

Around the the 37th year of the Meiji Era (1904), in the midst of the Russo-Japanese war, the small Japanese army, in need of assistance, uses its special flying (thanks to a benevolent demon) ship, the Amanohara, to attack Russia's major base at Port Arthur (Lushun). Umakai Shintaro, a Russian diplomat originally from Japan, defects and goes to Sapporo to teach at a girls academy. However, that girls academy is not typical—it is on board the Amanohara, and the five girls Shintaro teaches are known as the Raimu Unit—girls with the ability to summon powerful beings to fight for them. Shintaro eventually becomes their teacher and general in battle, and so the six embark on a weird and excessively erotic journey, as Shintaro helps the girls overcome their weaknesses, become stronger for the final stand at Lushun, and also understand the motives of the "Russian Spiritual Corps" that assist the opponent, which, unfortunately, has one member whom Shintaro knew well... (Source: ANN)