Devil Survivor 2: Record Breaker is a port of Devil Survivor 2. Suzuhito Yasuda, illustrator of Durarara!!, is the character designer of the Devil Survivor series. For a limited time, Izaya Orihara, Shizuo Heiwajima, and Celty Sturluson were available for download in the game.
Izaya appears in the second half of the collab event requesting a knife of this world as well as a snack with personality. Upon being given these things, he provides players with the Shady Informant's knife.
Upon completing various quests for Shizuo, players can receive Ikebukuro's Strongest Man Sign, which is a melee weapon shaped like an uprooted street sign. Shizuo's outfit also grants a unique skill and can be acquired by the player.
Celty is one of the first characters to appear during the collaboration. After players bring her various fairy demons, they can receive the Headless Rider's PDA COMP. Her outfit could also be acquired with the helmet unequipped. Female players wearing the outfit would appear headless.
More information about gameplay and downloadable content is available on Megami Tensei Wiki's page Devil Survivor 2 Record Breaker.