TWEWY 

The World Ends With You / Subarashiki kono sekai 

It is a really fun game to play .... it runs on Nintendo DS also can be played on a DS emulator

It's an Action Role-Playing game developed by the people who develop Kingdom Hearts :)

And its about Shibuya 

Collecting the pins are fun and also fighting the "bosses" who are the reapers

It was created in 2007 

I really like Neku and his headphones :3