Amnesia (アムネシア, Amuneshia) is a Japanese visual novel series by Idea Factory. It was first released on August 18, 2011 for PlayStation Portable, and then a fan disc in Japan, Amnesia Later, was released on March 15, 2012. Another sequel titled Amnesia Crowd was released on April 18, 2013. They were later combined for a PlayStation Vita release titled "Amnesia Later x Crowd V Edition" on October 16, 2014. Since this series is well received in Japan, it produced various related merchandise such as drama CDs, character music CDs and books. A 2013 anime television series has been produced by Brain's Base. A PlayStation Vita game has been announced.
The story of the original romance game for female players begins on the morning of August 1, when the protagonist wakes up and discovers she has absolutely no memories of the past. A boy appears before her, and he introduces himself as a "spirit" named Orion. The protagonist struggles to regain her memories under the guidance of Orion. She then gets a phone call, but she does not recognize the name on her mobile phone screen. She meets her apparent "boyfriend," despite not knowing his face.