The Kawai Boarding House isn’t your typical boarding house, but that’s where Kazunari Usa’s ended up while his parents work overseas. Frankly, he’s still not so sure about the place: his new roommate is a pervert and peeping tom, and the weapons-happy landlady and two of the female tenants all have some serious issues to work out. But then, there’s also Ritsu Kawai, who stole Usa’s heart the instant he saw her at his new high school. And that alone may just make it worth all the effort it will take to learn the complicated rules !