In 1998 winter, another world happens to come to existence in me, though I used to be a normal student. It is covering my ordinary life as the snow covers the ground. Until then, I haven't noticed, what has stayed unchanged in my daily life, the familiar scenes that have always been there, the warmth of the person whom I haven't noticed that I love her.

One week after losing his wife in an accident, the father of the Makino family finds himself thinking the wrong thing about his four lovely daughters. When the rebellious Natsume gets into trouble at school, it's time for daddy dearest to administer some discipline of the sexual variety. Soon, he's giving the same treatment to motherlike Akira, over-achieving Haruka, and sickly Fuyu.

Marina and Airi's mother divorced few years ago and got remarried recently to a young man. While Marina accepts her new stepfather, Airi detests him. Little do they know that really he's a pervert that sniffs their underwear and wants to make them his own by making a love drug that will turn Marina and Airi into a sex-hungry sluts.

The story begins with a very sexually active female lead imagining all possibly risky situations that she would have or could have had with her date if he didn't leave for the evening.

Nanami is a girl who always liked Akira, but she thinks that the thing that got in the middle of their love was soccer, therefore she kind of hates soccer.
One day Akira asks her to be the soccer school team manager and she denies it, but after that she is forced to be and after that their new sex lives begin a new cycle.

In the near future, the world as we know it has been spoiled by our negligence. From the stratosphere come five beautiful nymphs in the shape of angels, bearing the fragrance of forbidden fruit. It appears their desire is to bring pleasure to the devastated human race. A young programmer working late spots one of the beautiful girls on his balcony, peeping on a couple across the way.

When nurse-in-training Yumi reports for duty, she's confronted with an erotic lesson plan that leaves nothing to the imagination! Hands-on learning is harder than she ever dreamed, but the staff is behind her all the way. Depraved doctors, naughty nurses, and perverted patients each lend a helping hand to her erotic education.

As night arrives the shadows of Koga fall on Iga and a new threat exists for our lusty vixens. After a torid sexual encounter Yatsurugi Shinobu's best friend Mashiba Aya is infected with a parasitic bug and succumbs to its will. Having the same insatiable urges, the same tragedy is about to happen to Kage Lena.

Miki Katsuragi has finally landed her dream job, as an anchorwoman for the nine o'clock news. Unfortunately, this pretty reporter with a spotless reputation has a very dark secret. She's addicted to masturbation, and she can't stop for even a second!

On a forbidden hospital ward, the head doctor performs madly erotic experiments, stripping the nursing staff of their uniforms, inhibitions and self-control until even he is shocked by what he uncovers!