A boy is possessed by Byleth, the demon of the incest. He wants to madly love his sister, but his tragic end will be the natural epilogue of this morbid tale. 一个男孩被Byleth拥有，该乱伦恶魔。他想疯狂地爱他的姐姐，但他的悲剧结局将是病态的故事这自然尾声。