Persona 2 Tsumi: Lost Memories (ペルソナ2 罪 LOST MEMORIES) is an RPG developed by Atlus and menue for mobile phones.
- Japan: October 1st, 2007 (iAppli)
- Japan: November 1st, 2007 (S!Appli)
- Japan: December 12th, 2007 (EZAppli)
Everyone has a "Shadow Self," the part of themselves they don't want to be. They also have an "Ideal Self," the person they aspire to be. Tatsuya, Jun, Lisa, and Eikichi's Shadow Selves objected and tried to convince them that resetting the world was the wrong thing to do, and that they needed to accept reality. They had to kill their Shadow Selves before they could advance to the spirit of Longinus, kill him, and reset the world. They were able to defeat their Shadow Selves and defeat the spirit of Longinus only with the help of their Ideal Selves.
- Only Tatsuya could not defeat his Shadow Self during the events of Lost Memories, which is why he did not lose his memories after the world was reset.