Kazuha Akiyoshi is the oldest of six children. She's very responsible and also irresistably cute, but she is soemthing of a tomboy who has never allowed her romantic side to show through. Then she meets Mizushima, the first guy to treat her like a girl. He's Kazuha's first real crush, but does Mizushima feel the same way about her? And then there's Sugimoto, an older guy who's determined to make himself an important part of her life, only he's the one she hates more than anyone!