Dangan Ronpa (which literally means, "winning an argument with a bullet" in English) is a game released for the Playstation Portable or PSP. It is Japan exclusive and was released on November 25, 2010. It is of the murder mystery visual novel/video game genre developed and published by Spike.
The game, on it's first week of release, sold 25,564 copies in Japan. This would make it the top selling PSP game of the week, and eighth across all platforms. After three months, the game sold 85,000 copies which, considered by Spike CEO, a sucess.
There is no English translation of the game, but there is a let's play of it on The Something Awful Forums (the LPer sorta translates the game for you in English)
Currently, Dangan Ronpa is set to have an anime series this coming Spring 2013.
G A M E P L A Y
Dangan Ronpa's gameplay is similar to the Phoenix Wright/Ace Attorney series but with an emphasis on faster gameplay.
It is also has "Freetime Events" which are similar to the Social Link feature in the Persona series.
P L O T
Dangan Ronpa's setting is in an elite special school which accepts only high school students who are of the highest caliber in their respective fields, but it allows in one average student each year, chosen by raffle. This game's protagonist is Makoto Naegi, who holds the title "Super High School Level Good Luck". If I was to describe the game, Dangan Ronpa would be a mixture of Pheonix Wright, 999, and Battle Royale.