《低语中的秘密：揭示无声世界的真实》妹妹是我的玩具

　　Oat brings his girlfriend Rum a new gift : an old Mask he mysteriously found at his office. At first everything seems normal, but Rum starts hearing a sinister whispering at night, while Oat begins to act strangely towards her...Could the mask be the source of all this?