The song is called ココロの引力. I actually have no idea what it says since I'm too lazy to look up a translation :P
If you think this sounds familiar, its by the same artists who sing the Mahou Shoujo Madoka Magica and Ore no Imōto ga Konna ni Kawaii Wake ga Nai opening themes.
ClariS is two middle school girls (second or third year I think), and they have so much talent, its just amazing. I love their songs to pieces! :3
~Enjoy Enjoy! C:
