Kurotsuta Yashiki No HimegotoKurotsuta Yashiki no Himegoto; Kurotsutaya Yashiki no Himegoto; Kurotsutayashiki no Himegoto; The Secret of the Black Ivy Mansion; 黑色爬山虎宅邸秘闻; 黑茑宅邸的秘密之事; 黒蔦屋敷の秘めごと

When she was little, Chizuru lived in the house where her mother worked as a housekeeper and played all day with Yukihiko, the little lord of the Black Ivy Mansion. At some point she had to leave, and when she returns some years later she meets Yukihiko again. He invites her back into his house. But the mansion hides a terrible secret that Chizuru doesn't know…