Himari, a private tutor, is expressionless and never engages in small talk, only teaching. Kenichi, who loves pranks, slips an aphrodisiac into her drink. Although her body reacts to the drug, Himari initially stifles her voice and maintains her blank face. However, as she is caressed with a feather-touch, she falls into an intense climax! Kenichi secretly records the scene and proceeds to order her to perform fellatio. Despite her expressionless face, she becomes hyper-sensitive, drooling and moaning with guttural sounds as she orgasms over and over again...