Earl Cain (伯爵カインシリーズ, Hakushaku Kain Shirīzu), also known as Count Cain, is a shōjo manga series written and illustrated by Kaori Yuki. Earl Cain consists of five parts or "Series": Forgotten Juliet (忘れられたジュリエット Wasurerareta Jurietto), The Sound of a Boy Hatching (少年の孵化する音 Shōnen no Fukasuru Oto), Kafka (カフカ Kafuka), The Seal of the Red Ram (赤い羊の刻印 Akai Hitsuji no Kokuin), and the sequel series Godchild (ゴッド チャイルド, Goddo Chairudo).
Debuting in the Japanese manga magazine Bessatsu Hana to Yume in December 1991, the manga was eventually transferred to Hana to Yume, where it ran until 1994; the chapters of the sequel, Godchild, appeared between the May 2001 issue and the October 2003 issue in Hana to Yume. Together, the series spans 13 tankōbon volumes, with five for Forgotten Juliet, The Sound of a Boy Hatching, Kafka, and The Seal of the Red Ram and eight for Godchild. Two drama CDs based on the series were also released.
Having vowed to end Delilah's experiments with the dead, Cain solves murders while periodically running into Jizabel and other members of Delilah. After encountering Mikaila, who professes her one-sided love for him and wants to become Suzette, he becomes obsessed with destroying the organization and learns that it is secretly building a memorial temple. Meanwhile, despite Jizabel's efforts to delay Riff's second, hidden, and cruel personality from awakening, the hypnosis suppressing it breaks. Riff later declares to Cain that he secretly works for Delilah: the loyal, kind-hearted Riff Cain had known is an alternative personality used to deceive others. Alexis had intended for Cain to develop a close bond with Riff, only to break it, to remind Cain that he is unloved. After Riff's departure, Cain resolves to confront Alexis and promises Mary that they will have a tea party after the conflict with Delilah ends. Led by Cassian, whose brain has been transplanted into an adult body, he reaches the tower within the temple where Alexis plans to sacrifice the brainwashed people of London to revive Augusta. Within the tower, Riff reveals his intent to overthrow Alexis. Unconcerned, Alexis divulges that Riff is Delilah's longest surviving doll and will soon die. Riff attacks Cain, but Riff's other personality resurfaces, causing him to deliberately shoot himself. Riff's loyal personality triumphs over the cruel one, but he and Cain are separated. Because Riff's wound cannot heal, Jizabel commits suicide so Riff can use his blood to briefly remain alive and return to Cain. Meanwhile, Cain successfully poisons his father and with his death, the tower begins to crumble. Cain, unable to escape and hurt by the falling debris, reunites briefly with Riff. However, the ceiling collapses and Riff tries to push him away. Cain embraces him, choosing to stay.
After Cain's disappearance, Mary becomes head of the Hargreaves. Augusta possesses Alexis, and seeks out Mary in the mausoleum Cain had built before leaving to confront Alexis. Augusta reveals that she manipulated Alexis into abusing his sons and trying to resurrect her for her amusement. Before she can kill Mary, Augusta triggers Cain's trap in the mausoleum and dies. Years later, Mary is married to Oscar and pregnant with their child, although she still waits for his return. Crehador, a medium close to Cain, sets up a tea party for Mary, fulfilling Cain's promise; he then reminisces on how he found Cain being held by Riff's corpse within the ruined tower. The bunkoban-exclusive epilogue expands the ending slightly. It shows an elderly Mary, who lies on her deathbed attended by a woman nearby and hears the laughter of Jizabel's ghost as he plays with his pet sheep. Sensing a presence nearby, she dies, and taking the form of her ten-year-old self, her soul joins Cain hand-in-hand at a tea party with their friends and loved ones—although they exist as spirits, a boy nearby can hear them.