Digital Devil Saga: Avatar Tuner - A's Test Server

Digital Devil Saga Avatar Tuner: A's Test Server is an RPG released for Japanese feature phones as a side-story taking place in the Digital Devil Saga series.

The game begins when the protagonist Serph awakens in an enormous tower, entitled the Karma Tower, with no memories. The player takes on the role of Serph as he attempts to find out what happened to his memories.