|Furusaka Yui古坂 唯|
|Hair||Orange, Parted to Side, Waist Length+|
|Body||Pale, Slim, Young-adult|
|Clothes||Crop Top, Glasses, Jeans, Tank Top|
|Role||Non-blood-related Sister, Not a Virgin, Nurse, Older Sister, Telepath|
|Visual novels||Side character - Ouka|
|Voiced by||Kusunoki Suzune|
Non blood related little sister of Yuuya. Blamed herself for the misfortune that fell upon Yuuya after the accident so much that went so far as to gave her body to him. Suddenly went missing a year before, and the last half a year Yuuya was out of town searching for her. Has the power of "Shinsou" (soul performance).