The Shibuya-based Nintendo DS game is known as Subarashiki Kono Sekai (or It’s a Wonderful World, translated into English) in Japan. A quick search shows Square Enix registered two trademarks for that title (one with an English equivalent) back in 2006.
Since Square Enix already reserved the rights for The World Ends With You in the West back in 2007 and Subarashiki Kono Sekai in 2006, we’re curious why Square Enix Japan filed this trademark two months ago. We tried asking Neku Sakuraba, but he shrugged his shoulders and said, “I don’t get people. Never have, never will.”