Saburô Kadowaki

Poor virginal Shinobu! Her dream is to become a nurse and live a comfortable life, but that dream turns into a nightmare when she becomes the object of obsession for Junior, the sex crazed son of a major shareholder at the hospital where she works. When Junior is admitted to the hospital with alcohol poisoning, no nurse is safe! Will Shinobu escape Junior and his addiction to sex, or will she finally succumb to his amorous appetite? (synapse-films.com)

It's nighttime at the beach, and a young couple is frolicking on the beach under the moonlight. The girl's name is Mariko Kamura, and she and her boyfriend Yukio have forgiven each other for everything. Mariko is about to start her period and Yukio forcefully starts to feed her. The two of them climaxed and were gasping for air. At that moment thrusting of her hips from behind stopped and she stopped moving. Yukio's face was pale and flushed and a streak of blood was running down his forehead.