Girlfriend, Girlfriend Omnibus 1 (manga)

Now freshly in high school, Naoya gets to call his childhood bestie, Saki, his girlfriend. The two love each other, like, a lot, and Naoya boasts that he'll never have eyes for anyone else. So what does he do when Nagisa, an oh-so-sweet stranger, asks him out?! Unfortunately, Naoya is a passionately honest guy. He couldn't possibly lie to his heart or betray Saki. H-He must ask his dear Saki...for permission to date her and Nagisa at the same time! Vowing to make both girls happy, Naoya's crying, begging on his knees to give this love a chance. Can Saki be won over by Nagisa's dedication and utter cuteness?