[Special Edition] Your relationship with this girl who is characterized by her crafty smiles moves from "a bit special" phase with sleep sharing to "a bit sexual" phase. (CV: Rito Ichinose)
"My sister is at that age where I have no idea what she's thinking about, and her mood is all over the place." This binaural audio work explores the age old question of what truly lurks in a girl's lewd heart.