This three-minute video is packed with gameplay, cinematics, character introductions, action, drama, romance, and anything else you can think of. The only catch is that it's in Japanese, so unless you understand crazy talk, you probably won't know what's being said. (Note: The video stops short at the end because the last ten seconds got cut off.)
Japan will be getting the game next month, but those of us waiting for North American localization can expect it in September.
[Update: Trailer replaced with a version that doesn't cut off at the end.]