It's a Wonderful World preview at 1-up.

"Square Enix's newest original DS game, Subarashiki Kono Sekai (It's a Wonderful World in the U.S.) was recently released in Japan, and we spent a few hours with the final game. It was developed in part by Jupiter, the same company behind Kingdom Hearts: Chain of Memories on GBA, so it comes from the hands of people who know how to work best with 2D graphics.

The story of the game is a bit confusing at first (check our previous preview for a little bit more on it), but in a nutshell: You play as Neku, a hip kid in a very stylistic version of Tokyo's Shibuya district. Neku has psychic powers, so when a strange supernatural force that will kill him in a matter of days curses him, he goes to defeat the "Noise," a legion of demonic monsters who live in the psychic world. He soon runs into a girl named Shiki who becomes wrapped up in this craziness with him. And it all happens against a soundtrack with lots of hip-hop, techno and pop-inspired tunes -- pretty similar to fellow funky RPG Persona 3, in fact."

Full Source: 1-up

It's a Wonderful World review at Gamebrink.

"As soon as you hear the name “Final Fantasy”, you know it’s a Square-Enix title but what about “Subarashiki Kono Sekai”? You’ll have to have been reading your favourite gaming news media to know about this one. From the team behind the “Kingdom Hearts” games, SE’s latest RPG on the DS revolves around young Neku Sakuraba, a boy who one day finds himself part of the “Death God Game” in the busy streets of Shibuya in Japan. To survive the game, he’ll have to complete missions successfully over a 7 day period or be “erased”.

SE’s latest RPG contains many interesting features that set it apart from the traditional way these kind of games work. The first most notable feature of all is the “Cross Slide” dual battle system where you can control two characters simultaneously, each on a different screen of the DS. You control the bottom screen with stylus only and the top screen with either the D-Pad or XYAB buttons. It takes some getting used to so it’s no surprise the game allows you to set the top character on auto if it’s too much for you."

Full Source: Gamebrink

It's a Wonderful World Trailer 2 (in Japanese)