At the behest of the Queen, Earl Ciel Phantomhive hosts a lavish dinner party attended by several of the finest members of polite society—as well as struggling author, Arthur. But as the party reaches its high, a terrible murder takes place and none other than the Earl himself is suspected of the crime. As a violent storm rages on outside, the death count continues to climb. The Phantomhive household and their eminent guests find they must cooperate in order to solve this mystery before they too fall prey to the mysterious murderer. However, it seems that not even the perfect butler, Sebastian Michaelis, is safe from this horror.

When his wife is burned at the stake after being falsely accused of witchcraft, the vampire Count Vlad Dracula Țepeș declares all the people of Wallachia will pay with their lives. He summons an army of demons which overruns the country, causing the people to live lives of fear and distrust. To combat this, the outcast monster hunter Trevor Belmont takes up arms against Dracula's forces, aided by the magician Sypha Belnades and Dracula's dhampir son Alucard.

The introduction of 7G Network technology promised miraculous technological advancements; however, the aftermath of its launch plunged Japan into chaos. From drastic changes to the terrain to bizarre mutations among people, the way of life is overwritten with new rules. The town of Agano is one of the few remaining settlements, and its citizens aged 21 and above have transformed into animals. Shizuru Chikura, a high school student from Agano, is desperately searching for her friend, Youka Nakatomi. Coming across a picture in a newspaper placing Youka in Ikebukuro, Shizuru starts packing for a trip. But with public transportation effectively shut down, her options are limited. Fortunately, Tairo Zenjirou, a senile old conductor and the only human adult in town, comes to the rescue when he teaches her how to operate an abandoned train. With her destination set, Shizuru ventures off on a journey to find her missing friend. On the day of departure, however, her other classmates—Nadeshiko Hoshi, Reimi Kuga, and Akira Shinonome—decide to tag along at the last minute as they embark on this one-track adventure that might expose them to dangers far surpassing anything they have encountered in Agano.

In the year 5053, French aristocrats Viscount Albert de Morcerf and Baron Franz d'Epinay attend the festival of Carnival on the moon city of Luna. While Franz is just looking to have fun, Albert is seeking something more to fill his life—but he finds more than he bargained for in The Count of Monte Cristo, a mysterious and charming self-made nobleman who meets his gaze during an opera performance. Through a few twists and turns, Albert befriends the Count and introduces him into French society. The Count, however, has more on his mind than just friendship; he plots to finally unleash his vengeance on those who wronged him years earlier. Gankutsuou follows Albert and the Count's intertwined destinies and the ultimate price paid for enacting revenge. [Written by MAL Rewrite]