If you liked the Spiral anime, the Anime-Planet community thinks you'd like:
In a massive online world, people act only as well as their conscience demands. When one player's punishment is to be trapped in this world, a disparate group of people seek the answers why. Their motives are varied; their methods even more so. What stands between when we tear down the walls of reality? Where does our soul end and we begin?
Saitou Yakumo is a young man with a very special gift: he can see the souls of the dead and communicate with them. When the aloof student isn’t duping his fellow classmates out of their money with fake card tricks, he takes on paranormal cases that pique his interest. Making use of his unique abilities, logical mind and his contacts within the police, Yakumo strives to solve each supernatural case he takes on and bring those responsible to justice. But when the youthful detective becomes the target of a sinister duo can he get to the bottom of their scheme before he is dragged into a world of darkness and hatred?
Although Spiral focuses more around the "Blade Children" (actual people, rather than spirits), the main characters' attitudes are very similar. They are both intelligent, although somewhat unmotivated, and they both use this intellect to "investigate" cases and solve problems.
Kaihe is a high school student who has been given the task of becoming the chairperson for St Luminous, a private religious school for girls, after his grandfather died. Kaihe, along with a friend, arrives at the school to take care of business. But soon, mysterious disappearances start to happen. Will he unravel the mystery of the school and its past before its too late?
Tachibana Sakon is a skilled puppeteer with an unusual hobby: solving murders. Along with Ukon, a one-of-a-kind puppet made in the Meiji era, Sakon manages to find himself in a variety of life-threatening situations. Join the duo as they put their detective skills to the test in terrifying cases of revenge, malice, and murder.
Area 11 is still under Britannian rule and the Elevens remain brutally oppressed; what’s more, their saviour, Zero, is nowhere to be found and all of Britannia believes the rebellion is finally over. Elsewhere, having lost the battle, Lelouch sets his sights upon winning the war – but the task is no easier since the Britannian forces have learned some valuable lessons all of their own. Not only have they discovered his identity and captured many of his Black Knights, but they now manipulate the memories of all of his friends. Worst of all, they have taken the most precious thing in his life – his dear sister, Nunnally. With his hatred for the Britannians stronger than ever before, Lelouch must now recuperate his forces and bring their rule of terror to an end.
Both shows have a head strong leading man, whom are highly intelegent. LeLouch and Ayumu Narumi have both suffered from tramatic events in their childhood and are now on a mission to unlock the past, preasent, and future.