Myself ; Yourself (マイセルフ；ユアセルフ, Maiserufu ; Yuaserufu?)[a] is a Japanese visual novel developed by Yeti which was released on December 20, 2007 for the PlayStation 2. Myself ; Yourself is the second original game published by Regista, the first being I/O. Takumi Nakazawa, the main scenario writer for the infinity series (Ever17, Remember11), is the principal writer for Myself ; Yourself. Character design for the game is provided by Mutsumi Sasaki, who also did the original character design for Memories Off, Happy Lesson, and Futakoi. Before the game's release, a light novel based on the story, written by Takumi Nakazawa, and illustrated by Wadapen, was serialized in the Japanese bishōjo magazine Dengeki G's Magazine between March and November 2007, published by MediaWorks. An anime adaptation began airing in Japan on October 3, 2007 on the TV Kanagawa television network, and contained thirteen episodes.

Source: Wikipedia