Mizutani (26). A female teacher teaching modern Japanese at higher education. She is highly praised by students and parents for her passionate and straightforward guidance, which is considered the ideal image of a teacher. However, it seems her daytime and nighttime personas are different. She becomes intimately involved with a man she meets at a bar, falling into a submissive role. What should be a healthy relationship... is instead marked by being masked, having her breasts pulled, and groaning in agony. She is also ordered by the man to shave her pubic hair completely. In front of her students, she maintains a pure, clergy-like demeanor, but during holidays, she transforms into a perverted creature that gleefully exclaims 'oh-oh-oh'...