Kazunari Usa is a high school student who will be living alone for the first time owing to his parents' relocation. Excited about his new independent existence, he wants to spend his adolescent years without having to deal with odd people, but as he quickly finds, his new boarding home, Kawai Complex, is anything from conventional. The many residents in the Kawai Complex are all oddballs. Kazunari's roommate, Shirosaki, is a pervert and masochist; Mayumi Nishikino, a slightly alcoholic office lady, despises couples because of her bad luck with men; and Sayaka Watanabe, an apparently innocent college student, likes leading guys on. Kazunari is prepared to leave his new home, distraught about the absence of nice people.