I Hate You More Than Anyone Vol. 1

Kazuha Aklyoshi is the eldest of six children. She's very responsible and also irresistibly cute, but she is something 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!