Lost+Brain is a Japanese manga series written by Tsuzuku Yabuno and illustrated by Akira Ōtani.

It was serialized in Shogakukan's Weekly Shōnen Sunday from December 2007 to July 2008, with its chapters collected in three tankōbon volumes.

[4][a] Shogakukan collected its 27 individual chapters into three tankōbon volumes, published from May 16 to August 11, 2008.

This may have been due to the fact that the main character was bored of the world, and he wanted to change it, and age are both similar to Death Note's Light Yagami.

As the story progressed however, it became more to do with the main character utilizing hypnosis to change people for the better.