Kojo No Eden Dare Ni Mo Ienai Kyodai No Himitsu (Honey) [Light Novel]

[Machine Translation] We are sinners by nature. Ernest and Cordelia, a brother and sister, move to an old castle when their older brother becomes a priest after discovering his talent as an exorcist. The castle is said to be haunted by ghosts in a village where the legend of the vampire princess remains... In fact, Cordilia becomes obsessed and tormentsed by blood-sucking urges. Whispers tell Ernesto that the spirit of a powerful exorcist can help, and after much anguish, he takes on the role himself... The price for the sinful brother and sister who have fallen in love with each other is...

我々は生まれながらに罪人なのだ―。祓魔師の才能を見出された兄が司祭になったのを機に、とある古城に移り住んだアーネストとコーディリアの兄妹。吸血姫伝説の残る村に幽霊が出るという城...事実、コーディリアは取り憑かれ、吸血衝動に苛まれるように。力のある祓魔師の精が効くと囁かれたアーネストは苦悩の末、自らその役割を担い...。愛し合ってしまった罪深き兄妹の禁忌の代償は―。