Set in a coed school's mixed-gender anal health checkup! "You were watching the teacher's examination earlier, weren't you? There's nothing to worry about, okay?" As these words echo through the room, class representative Kanna steps forward as the first student to undergo the exam. She admits to having bowel movements twice daily, and as she removes her upper clothing, her strikingly pale skin—marked red from her bra—draws immediate attention. While enduring the examining gaze, she performs squats, her shy and reserved nature becoming increasingly evident. On the monitor, her perfectly clean pink anus is fully visible. "It's important for you to check it yourself too," says the teacher, making Kanna grow even more tense. During the digital rectal exam, she lets out soft moans: "Uhh... It feels strange... in a way I can't describe..." The teacher gently reassures her, "Everyone feels that way at first." Next, she's handed a pinworm test slide, pushing her embarrassment to the absolute limit. The deep inside of her anus is displayed on screen as various medical tools are inserted one after another, thoroughly examining her sphincter condition. Meanwhile, boys are shown peeking from behind the partition, only to be scolded with laughter: "Hey! Boys! No peeking over the screen!" Note: This title starring Shiraki Kanna does not include anal sex.