Amnesia was originally a Japanese visual novel series by Idea Factory. It was first released on August 2011 for PlayStation Portable, and then a sequel (called 'fan-disk' in Japan) Amnesia Later was released on March 2012. Another sequel titled Amnesia Crowd was released on 2013. The series was well received in Japan, so it has a lot of related merchandise released, such as Drama CDs, Character music CDs, books, etc.
 

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           Amnesia is classified as an otome game which means the player takes the role of the main female character who can choose from a variety of male characters as her 'love interest'. However, in Amnesia, the male characters that the female player character can interact with are based on the symbolic suit symbols from a playing card deck with the following storylines (commonly known as 'routes') in the game: Heart, Spade, Diamond, Club and Joker. Depending on which route you pick, your relationship with each character is different. After picking a guy, the heroine will be in a world where the chosen guy is the boyfriend