Yashakiden Series by Hideyuki Kikuchi, Jun Suemi

After a devastating earthquake that left most of Japan in ruins, the district ward of Shinjuku in Tokyo has opened up a doorway into another dimension - becoming the halfway-house suspended between the mortal world and the supernatural. It has become a place where the living fight a losing battle with monsters and demons from the netherworld - a constant struggle for control on grounds which inevitably may plunge into the depths of Hell. Factory manager by day and moonlighting P.I... moreAfter a devastating earthquake that left most of Japan in ruins, the district ward of Shinjuku in Tokyo has opened up a doorway into another dimension - becoming the halfway-house suspended between the mortal world and the supernatural. It has become a place where the living fight a losing battle with monsters and demons from the netherworld - a constant struggle for control on grounds which inevitably may plunge into the depths of Hell. Factory manager by day and moonlighting P.I. by night, Setsura Aki is no stranger to danger. Specializing in missing-persons cases and considered the best "man hunter" in the business, he allies himself with friend and rival, Doctor Mephisto, a wizard of physical and spiritual surgery. Together in battle, there is none that can compete with their combined wit and power - until now. Coming from the deepest and darkest parts of China, four immortal vampires, led by one of unmatched beauty who goes by the ubiquitous title "Princess," mystically sail into landlocked Shinjuku aboard an ancient ghost ship. She and her ancient undead entourage with powers never before seen of vampires, have surmounted four thousand years of space and time to seize control of Shinjuku and make it their own. It is up to Setsura and Mephisto to uncover their new formidable foes' true origins and to reveal the truth behind the Princess's dark plans for the city. less

A vicious vampire gang four thousand years in the making has awakened from its slumber in order to seize control of Demon City Shinjuku. Princess, Kikiou, Ryuuki, and Shuuran are as persistent as they are merciless, especially when the target of their attacks is Setsura Aki.

The immortal vampire gang led by Princess --Kikiou, Ryuuki, and Shuuran -- is slowly but inexorably taking over Demon City Shinjuku. Its citizens and the administration alike are turning into vampires. Mephisto has apparently allied himself with them of his own accord. Setsura Aki stands alone on the brink of extinction, tested by one desperate counterattack after the next... moreThe immortal vampire gang led by Princess --Kikiou, Ryuuki, and Shuuran -- is slowly but inexorably taking over Demon City Shinjuku. Its citizens and the administration alike are turning into vampires. Mephisto has apparently allied himself with them of his own accord. Setsura Aki stands alone on the brink of extinction, tested by one desperate counterattack after the next. Intending to snuff out his life once and for all, Princess unleashes the self-regenerating Kazikli Bey (better known abroad as Vlad the Impaler, the original Dracula). Meanwhile, concerned about the worsening state of affairs in Shinjuku, a team of foreign legionnaires -- Special Forces Operational Detachment "F" -- is dispatched to Demon City. less

As the immortal Demon Princess inexorably transforms Demon City Shinjuku into a vampire metropolis, Setsura infiltrates her manor house alone. There he encounters the puppet paramours and "picture soldiers" created by the warlock Kikiou. The witch Galeen Nuvenberg once again comes to the rescue. But that only draws her into Princess's crosshairs as well... moreAs the immortal Demon Princess inexorably transforms Demon City Shinjuku into a vampire metropolis, Setsura infiltrates her manor house alone. There he encounters the puppet paramours and "picture soldiers" created by the warlock Kikiou. The witch Galeen Nuvenberg once again comes to the rescue. But that only draws her into Princess's crosshairs as well. Meanwhile, panicked by the growing vampire hordes in Shinjuku, the Japanese government and its American allies resolve to sterilize the city with nuclear weapons. As if taunting the stranded and isolated Setsura, the countdown to disaster has begun. less

Princess, the legendary evil vampire from ancient China, and her followers Kikiou and Ryuuki have unleashed the plague of vampirism upon the already debauched and depraved city on the edge of the abyss. As more and more of Shinjuku’s citizens turn into creatures of the night, a secret government plan is hatched to annihilate Demon City with a nuclear device... morePrincess, the legendary evil vampire from ancient China, and her followers Kikiou and Ryuuki have unleashed the plague of vampirism upon the already debauched and depraved city on the edge of the abyss. As more and more of Shinjuku’s citizens turn into creatures of the night, a secret government plan is hatched to annihilate Demon City with a nuclear device.As the clock ticks down, beautiful manhunter Setsura Aki enters Princess’s kingdom to retrieve Princess’s hostage—the Prime Minister of Japan. There he meets a mysterious mask maker from a bygone era and undergoes a transformation. But will it be in time to save Shinjuku?Meanwhile, the Demon Physician—Doctor Mephisto—remains a voluntary prisoner in Princess’s camp. To what end—and whose side is the good doctor truly on?And in Shinjuku’s Magic Town, Tonbeau Nuvenberg and the Doll Girl find the portal to Princess’s kingdom—a box sealed by magic. To open the box, they must do the impossible: access the timeline of the Universe itself—the Akashic Records.The thrilling conclusion to the great vampire series, Yashakiden: The Demon Princess— by the master of Japanese horror fiction—Hideyuki Kikuchi. less