Not-so-average teenager, Daisuke Niwa, has had an abnormal life. His mother and grandfather have trained him his whole life by setting up traps that can kill him if he doesn't figure them out. On his fourteenth birthday, he discovers why. When any male in the Niwa family turns fourteen, Dark also gets access to their bodies. Dark is a master thief who always leaves notices before he steals items. He's been around for ages and every male must help keep up Dark's reputation. Although dark can take over Daisuke's body, and talk to him in conscience, they are not the same person. Daisuke turns into Dark by from sudden feelings of love, usually brought on by a picture of his crush, Risa Harada. The only way Daisuke can be his normal self (Darkless), is to have the Holy Maiden. This maiden being a girl, and they must love eachother. The problem is, Risa has no feeling for Daisuke, and immediately after seeing Dark for the first time, falls for Dark instead. Daisuke's schoolmate, Satoshi Hiwatari, knows that Daisuke is also Dark and is trying to stop him, as well as Risa's sister, Riku, slowly finding out his identity. Daisuke must dodge these bullets, try and win his Holy Maiden, maintain Dark's reputation, as well as trying to hide his secret identity.