Hikari is a naive girl who has just moved to the city. She ends up living in a shared house, but the residents there are all big men. Tall, fat, muscular, foreigners. She ends up living with a variety of people, but they use convenient words called "house rules" to make her do lewd things. Although she was confused at first, she gradually gets used to the rules of the house and starts to enjoy the naughty things.