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。

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 morb