In 19th-century France, the wife of vampire noble Jean Duchet Godard is murdered in her own home. With the local human authorities unwilling to properly investigate the case, Godard hires a pair of private detectives known to specialize in the supernatural: Tsugaru Shinuchi, a man with a mysterious birdcage; and his partner, Aya Rindou. This enigmatic duo has come from faraway Japan for one purpose—to track down the man who stole both Aya's body and Tsugaru's humanity.

In a world where memories exist in memory chips separate from the body, death of the body no longer means death of the soul. It is possible for memories to be viewed, altered, and transferred between bodies. These memory chips are used by the rich to obtain eternal lives in carefully selected bodies, while for the poor, selling their own bodies and conserving their souls in the chips often become the only way to earn a living. An electrolytic cloud in the sky serves as a barrier between the heavens of the fortunate and the underworld of the destitute, making this social division impregnable. One day, a man named Kaiba wakes up in an empty room with no memories, a mysterious hole in his chest, and a locket holding the picture of an unknown woman. After escaping an attack and stumbling upon a decrepit village of underworld residents, he begins his adventure across the different planets of this strange universe to find out more about his own identity and the woman he once knew. Through a journey of self-discovery and acceptance, Kaiba weaves together tales of souls and spirits and explores the importance of memories. [Written by MAL Rewrite]

In a distant future, Earth has become a wasteland and humanity as we know it has died out. All that remains are sentient robots. They were supposed to be able to live forever—until the one called Luna died and The Ruin started. Their bodies will rust, and there is nothing that can be done to fix it. Now the robots are left only to contemplate their deaths, kept going only by the rumor that if they eat the one called Casshern they will gain immortality. Casshern knows nothing about his past, why he exists or what he is, but he must find out or he will face the constant torment of being hunted by robots who don't want to die. Casshern leaves death wherever he goes, but he must face it if he is to find out the truth of this world. [Written by MAL Rewrite]

ACCA—a national body of the kingdom of Dowa that provides public services to the citizens of the country—was established as part of the peace settlement between the king of Dowa and the 13 states of the country during a revolt. One hundred years later, Dowa is in a period of unprecedented peace, due in part to the ACCA system. However, rumors of a coup d'état start to surface. Jean Otus, the second-in-command of the inspection department of ACCA, is charged with inspecting all 13 state branches. What will he discover as he performs his audit? Intriguing and mysterious, ACCA: 13-ku Kansatsu-ka is a politically-themed mystery that reveals a world of diverse cultures and lifestyles, with intricate connections between its characters, as the truth of the coup d'état slowly unfolds. [Written by MAL Rewrite]