If you're looking for manga similar to Psyren: Another Call (Light Novel), you might like these titles.
Doppo Kunikida is an idealist and a strait-laced detective at the Armed Detective Agency, an organization that takes on dangerous jobs that even the police won't handle. Everything in his life is progressing as planned until one day he's ordered to watch over the new guy, Osamu Dazai, a suspicious fellow of unknown origin who is obsessed with the thought of suicide. While investigating an unusual case involving a so-called haunted building, they find several of the missing people from another investigation. However, before they can find out how these cases connect, they are attacked by the mafia's Ryunosuke Akutagawa, sworn enemy of the agency! This is the beginning of a hopelessly inseparable relationship between two detectives. A battle of Abilities erupts in the shadows of Yokohama!
Welcome to the classes of horror! I will be your guide to a world that lurks under everyday life. For these lessons, you don't need text books or notebooks. If you're prepared for the worst...
Widely known as "The Modern-Day Sherlock Holmes", Shinichi Kudo is doing amazing work as a high school detective. One day, he heads to an amusement park with his childhood friend, Ran Mouri. But there he spots two suspicious men in black, and sensing a case abrewing, decides to tail them. Unfortunately, one of the men quickly realizes that Shinichi is following them, knocks him out, and forces him to take poison. And when he comes to, he finds that his body has shrunk back to that of a child?! Starting that day, he took the name "Conan Edogawa" in order to not reveal his true identity even to Ran, and began solving cases as a little elementary school detective!