Our pleasure is your defeat ... You may be a genius scientist, but you cannot contend with our powers at their highest. The more I am aroused the stronger I get! You will not hurt our city. Do not try to trick us with your harem of women and tentacle sex machines. The robots are trained and will defeat you!
Zetsarin Oh, Engage!

The Takashiro family ... a traceable Daimyo that leads back to a historical lineage of nobility, has recently been on a shameful course, ruining the image they have had since the old days.
Nanako is the Takashio family's only daughter. She is in a weak condition, living most of her life sleeping and passing the day hiding her lustful thoughts for Yujiro. All the while the presence of a dark plot draws near. A rival family has their sights set on taking away the family's assets, especially the sweet young snatch of the beautiful Nanako. But Nanako isn't the only female member of the Takashiro's willing to pay back the family's debt - her mother is also getting in on the action in a jaw dropping display of eroticism that has the Takashiro women surrendering their bodies to a gang of carpet munching marauders.

Wafaru is a guy next door. One day he saw a little innocent looking girl in his room. Her name is Harumi. She asked Wafaru if she could stay with him. She didn't have anywhere to go. Because of her innocence she doesn't know anything about a man's body and even her body. Wafaru showed her his member and explained to her it was his pet. She loves playing with it so much without knowing what it really is. Wafaru cannot live with the lies he continues to tell her. In a fit of guilt he has way with her without revealing his secret.