If you're looking for manga similar to Psychic Detective Yakumo, you might like these titles.
Midori's mother has finally acquired her dream home, but it isn't long before supernatural phenomenas disrupt the peace of the family. And if unexplained electricity failures, strange phone calls, and the eerie presence of spirits weren't enough, finding unexplainable blood in the bathroom becomes the last straw. Mai and Shibuya Psychic Research are brought in to investigate, but what horrors will they find in the 'dream' home that turns out to be nothing but a nightmare?
On her first day as a police academy trainee, Haruna is assigned to keep an eye on Ishikawa Ango, a driven and resourceful detective who has recently survived a gunshot wound to the head. What Haruna doesn't know is that the incident has given Ishikawa the ability to see and communicate with spirits of the victims, making him even more determined to use his special ability to catch culprits.
Mai Taniyama is a normal high school student who enjoys ghost stories like most teenage girls. However, a chance encounter with Naru - the young, handsome and conceited president of Shibuya Psychic Research - pulls her into the world of ghost hunting. Mai now finds herself working for SPR as an assistant along with a catholic exorcist, a Buddhist monk, a self-proclaimed Shinto priestess and a famous medium. Together this group of paranormal investigators must solve various mysteries around the country, but is Mai so normal after all, and just who is Naru anyway!?
Because of the extraordinary power she has, Shuri Otokawa was always living in the dark full of fear and distress. Eventually, she decided to become more optimistic about her life when she started a new job at her aunt's research laboratory. However, at such a crucial time in her life, the one who appears in front of Shuri is...?!
There is a certain detective company on 7-chome Kagurazaka, Shinjuku-ku, Tokyo. Tsukioka Haruhi, Kannawa Yato, and Minakata Utsuhi. They are the rumored youkai boy detectives in the streets. You who are suffering from strange, weird, irrational, incomprehensible phenomena! If you come to this detective company, you will be immediately resolved and witnessed the monument!
They have been maintaining the balance of Yin and Yang since ancient times. Whenever the world is in chaos, there are many cases where evil spirits come to do harm to humans. The gods select talented humans and they are given their own guardian god for them to calm the over flow of Yin. This has continued all the way up to the present, so those that are chosen by god are hunters that eradicate ghosts, they are called Ghost Hunters.