One day, he sprains his ankle and visits the nurse's office. There, he finds a beautiful but somewhat dangerous nurse, Ms. Riho. She approaches him under the pretense of treating him, but underneath her white coat she's hiding a lewd, daring, and provocative swimsuit! "If you make a sound, your girlfriend might find out," she whispers with a grin, straddling a male student and showing him her breasts, simply to satisfy her own sexual desires.