Chaos;Head

Seeing is believing and perception is reality is the premise behind the anime series Chaos;Head. There is an implication that, if you can manipulate people's perception, you can influence their reality. To a certain extent, this is what advertising and marketing try to do. Chaos;Head takes this to a whole new level when a become possible to manipulate a person's perception through technological means. There are a few people who can do this naturally, and the story centers on of them, Nishijou Takumi.

Takumi is one of the most annoying characters I've ever seen, but that is intentional. He is a an otaku, or geek, and we all know how annoying people with those personality traits can be. ;-) In the end he does what needs to be done, as all heroes must, but his character develops significantly along the way. Overall, the series is an enjoyable story.