Akiko Himenokouji has spent six years apart from her brother Akito after their parents' deaths split the family, and the moment they are living under one roof again, she announces that she is in love with him. Akito treats the line between them as final, which is harder to hold than it sounds: he works as caretaker of his school's student council dorm, so the house also holds council president Arashi Nikaidou, vice president Anastasia Nasuhara, and his childhood friend Ginbei Haruomi Sawatari, all of whom want him for themselves.