that ISN'T FROM AN ANIME :O
I'd say either "Marisa Stole the Precious Thing" by ARM (attributed to IOSYS sometimes) or "Mojipittan (Futari Remix)" by...someone...
Aru Machi no Gunjou (http://youtube.com/watch?v=Ti0WXGqVyzU) by Asian Kung-Fu Generation. Love that song! ^_^
northern lights.
by 403.
not sure if it's japanese though....
sounds like it though... :P
Climax Jump by AAA.
It's the theme song to Kamen Rider Den-O. Pwnzors
It's a toss up between Reset (can't remember the artist... >.>) Karma by Bump of Chicken, or Chance by UVERworld.
Houki Boshi by Younha
It's a tie for me. I can't decide between "Embryo" by Dir en Grey and "Tomorrow's Way" by YUI.