With!!

Only days before their high school festival, the popular and outgoing big brother, Shiro, saves his beloved little sister, Masago, by pushing her out of the path of a truck. Unfortunately, Shiro dies in the process. Masago, who is average in every respect compared to her brother, feels overwhelming guilt and blames herself. She even wishes she had died instead of Shiro. At that moment, she becomes possessed by her brother's spirit, and from then on, they are two very different personalities sharing one body! (Source: CMX) The manga series "With!!" had three volumes published in English as "Oh! My Brother" by CMX Manga, from October 13, 2009, to August 31, 2010. Publication ceased when the company went defunct.