Tsuki ni Kiss no Hanataba O

[From ShoujoMagic]:

Kahara Hitomi met Nagatsuki Atsuya when she was a child, and they made a promise to see each other again, but Atsuya never showed up. Because of that unkept promise, Hitomi hasn't been able to trust any guy ever since. Although Atsuya broke Hitomi's heart, she can't stop thinking or dreaming about him--even now that she's a college student--and she secretly wants to find her first love again. Then one night at a club, a man named Nagatsuki Atsuya appears before her! But is he the same Nagatsuki Atsuya...?