War rages between two neighboring countries, but one side has an ace up their sleeve: an ancient dragon bound by a pact to protect the nation. Despite these overpowering creatures being capable of leveling entire battlefields, they are rendered useless by cavities. And so, a special unit—the dragon dentists—has the important duty of caring for the dragon's teeth. Nonoko Kishii was the only one of many brave volunteers who survived a recent round of recruitment; in order to join the dragon dentists, one has to witness their future demise and accept it without a fight. Knowing the exact circumstances of their fated ends, the dragon dentists devote themselves to their work. One day, they gain a new member who did not undergo the test: Bernard "Bel" Octavius, a young enemy officer killed by his own men and revived by the dragon's teeth. Despite his appearance being an omen of a great disaster, he is placed under the care of Nonoko as a dentist-in-training. Will Bel come around to the dragon dentists' attitudes toward death and help them face the painful future that is to come? [Written by MAL Rewrite]

The year is 1931. The city is Shanghai. Ten years before America will enter World War II, the hydra's teeth planted by the first great global conflict are beginning to germinate. Hatching like spiders, they weave the complex web of plots and conspiracies destined to inevitably draw entire nations to the brink of destruction. Caught in the heart of these webs, desperately seeking to separate lies from truth, is "Sakurai Kikan," an ultra-secret intelligence agency staffed by extraordinarily talented individuals with abilities far beyond those of normal humans. Their duty: to stop the darkest plots and eliminate the greatest threats. But in a city built on intrigue, can even a team of clairvoyants, telepaths and espers stand against the ultimate forces of destiny? (Source: Sentai Filmworks)

Manji is an infamous swordsman in feudal Japan who is known as the "Hundred Man Killer," as he has killed one hundred innocent men. However, there is something far more frightening than his ominous reputation: the fact that he is immortal. This is the handiwork of eight-hundred-year-old nun Yaobikuni, who placed bloodworms capable of healing almost any wound in Manji's body. To atone for his crimes, Manji resolves to kill one thousand evil men. Yaobikuni agrees to this proposal, saying that if he succeeds, she will undo his curse of immortality. Soon after this promise, Manji meets Rin Asano, a 16-year-old girl who requests Manji's assistance in killing those who slaughtered her parents. Initially reluctant, Manji refuses Rin's desperate plea. However, owing to her evident lack of strength, Manji changes his mind and agrees to protect Rin for four years. With this partnership set in stone, the two embark on a perilous journey of bloodshed, vengeance, and redemption, each to fulfill their own life's cause. [Written by MAL Rewrite]

Fam and Ihrie are willing to do almost anything to make a buck. So when these debt-driven damsels discover the potential profits to be hand in recovering a particularly dangerous mystical object, it means mortal peril for an entire civilization. There's no guarantee that they'll live long enough to squander the fabulous wealth they've been promised, and danger lurks around every turn as they cross dark seas in pursuit of legendary evil. Haunted by an unspeakable curse, plagued by doomsday prophecies, plotted against by untrustworthy traveling companions and looked in desperate race to gain the Ultimate Power, Fam and Ihrie are the Ruin Explorers! (Source: AniDB)