Recommend me Happy Love Songs

[terra]

Hi guys,
I'm in such a blue mood right now, for a silly thing I became depressed. Really it's a really really silly thing if I told you but it has dragged me into this state T_T

The story is that I watched Tada, Kimi wo Aishiteru where Tamaki Hiroshi and Miyazaki played such a depressing story and Ai Otsuka's Ren'ai Shashin was used as the soundtrack, which fit in perfectly. The ending depressed me (for you who watched the movie, you'll know) and I'm Tamaki fans btw,,

That's why when I tried to cheer myself with a song, I see that most of my love songs are sad or happy but sad in the melody, so I couldn't cure myself. Most Ayu's ballad seems sad, Ai Otsuka, Kuu, Hikki and Yuna Ito too

So I guess I could ask you guys for help, which song tells us about a happy love story in a happy melody.

Thank you