I've read it some time ago, but can't remember the title. It was about this guy who bullied this girl when they were younger(?) and she holds a grudge against him since then. Years later, they meet again during a party and the guy falls for her, but doesn't realize it's the girl from before. She, however, recognized him immediately, so he finds out later on and tries to make her fall in love with him.

Anyone know what it is?

kimi no sei?

yes it is kimi no sei it is not fully scanned though

yay! I love the manga ^^ Unfortunately, it's not...The scans are slow, but worth it?

i liked it. couldn't hold back from reading spoilers because it wasn't finished for a while